General Information
On the 3rd of June the following was released:
- ISL Light 5.0.2551.107 for Windows (release_date=2026-05-28, build=13f52db762bd22a9fa443cde48a3ab160e76402b, platform=win32,os_version=0x0a000000-0x7fffffff)
- ISL Light 5.0.2551.107 for Mac (release_date=2026-05-28, build=13f52db762bd22a9fa443cde48a3ab160e76402b, platform=mac, os_version=0x0e0000-0x2effff)
- ISL Light 5.0.2551.107 for Linux (release_date=2026-05-28, build=13f52db762bd22a9fa443cde48a3ab160e76402b, platform=linux64, os_version=0x050fc10000022300-0xffffffffffffffff)
- ISL Light Client 5.0.2551.107 for Windows (release_date=2026-05-28, build=13f52db762bd22a9fa443cde48a3ab160e76402b,platform=win32, os_version=0x0a000000-0x7fffffff)
- ISL Light Client 5.0.2551.107 for Mac (release_date=2026-05-28, build=13f52db762bd22a9fa443cde48a3ab160e76402b, platform=mac, os_version=0x0e0000-0x2effff)
- ISL Light Client 5.0.2551.107 for Linux (release_date=2026-05-28, build=13f52db762bd22a9fa443cde48a3ab160e76402b, platform=linux64, os_version=0x050fc10000022300-0xffffffffffffffff)
- ISL AlwaysOn 5.0.2551.107 for Windows (release_date=2026-05-28, build=13f52db762bd22a9fa443cde48a3ab160e76402b, platform=win32, os_version=0x0a000000-0x7fffffff)
- ISL AlwaysOn 5.0.2551.107 for macOS (release_date=2026-05-28, build=13f52db762bd22a9fa443cde48a3ab160e76402b, platform=mac, os_version=0x0e0000-0x2effff)
- ISL AlwaysOn 5.0.2551.107 for Linux (release_date=2026-05-28, build=13f52db762bd22a9fa443cde48a3ab160e76402b, platform=linux64, os_version=0x050fc10000022300-0xffffffffffffffff)
All updates with version 5.0.2551.107 have release date set to 2026-05-28. This release is available for Hosted Service users.
IMPORTANT: Code Signing Certificate Change
Internal executables and DLLs are now signed with a PDQ certificate. Previously, these were signed by ISL Online LTD. If you have allowlist or trust policies based on the signing certificate, please update them accordingly.
Improvements
ISL Light - Desktop - Link my account features from ISL Light (FEATURE) [ISLLIGHT-6299] More
Description
A new "My account" submenu was added to the dashboard dropdown in ISL Light. It exposes direct links to the user's web pages: Administration, License Usage, Reports, My Profile and Security. When the server supports the session-pass functionality the user is taken directly to the requested page without having to log in again.
Each entry can be hidden through custom command line:
- customization?disable_administration_link
- customization?disable_usage_link
- customization?disable_reports_link
- customization?disable_account_link
- customization?disable_security_link
The whole submenu is hidden when "customization?disable_web=true" is set or when the server does not provide the corresponding product page list.
ISL Light - Desktop - Add Support for Blinking Icon on Chat Entry in Join Mode (FEATURE) [ISLLIGHT-7060] More
Description
In previous versions when ISL Light was running in join/client mode and a new chat message was received while the window was inactive or minimized, user was not notified. The functionality was redesigned, now the taskbar icon starts blinking to notify the user of the new chat activity. The blinking continues until the user opens the ISL Light window. The same behavior also applies on the operatro side, so chat messages from the client are no longer missed when ISL Light is in the background.
ISL Light - Desktop - Add a customization option to put ISL Light in "integration mode" (FEATURE) [ISLLIGHT-7447] More
Description
A new integration mode customization was added to ISL Light. When started with --on-load "customization?integration_mode=true", the standard login form is replaced with a dedicated integration screen, so end users are not shown a login dialog when the application is launched as part of an integrated platform. Sessions started from the web or AlwaysOn connections from the web continue to bypass integration mode and behave normally.
ISL Light - Desktop - Show Login/Access password option when typing (FEATURE) [ISLLIGHT-7454] More
Description
A show/hide password option was added to the password fields in ISL Light. The icon is now visible in the Login page password field and in the Access password dialog when connecting to a remote computer from the Computers tab. Clicking the icon toggles password visibility, making it easier for users to verify what they typed.
ISL Light - Desktop - Add customization support to minimize ISL Light on start (FEATURE) [ISLLIGHT-7463] More
Description
ISL Light can now be configured to automatically minimize its window when a session starts. The behaviour is controlled by the new command line option '--on-connect "main?minimize=true"'.
ISL Light - Desktop - Add support to enable/disable features in ISL Light: "Change screen resolution", "Whiteboard tools" (FEATURE) [ISLLIGHT-7467] More
Description
Added support to enable or disable "Change screen resolution" and "Whiteboard tools" in ISL Light session. Features can be set through the command line via --on-load "customization?hide_whiteboard_tools=true&hide_change_resolution=true". When whiteboard tools are hidden, the automatic marker tool is also suppressed when the client revokes remote control, so the viewer cannot draw without having control.
ISL Light - Desktop - Request TCC when enabling restart and resume on macos (FEATURE) [ISLLIGHT-7468] More
Description
ISL Light now triggers a macOS TCC (Transparency, Consent and Control) prompt for the "ISL Light Streaming" component when the operator enables Restart and Resume in a remote support session. This ensures the user is properly asked to grant the required screen recording permission so that Restart and Resume can continue working across logout and fast user switching. New UMA metrics RestartNResumeOK and RestartNResumeFailed were added to track success and failure of the operation.
ISL Light - Desktop - Migrate code http://*r301 links to https://*r301 AKA safe help page urls (FEATURE) [ISLLIGHT-7486] More
Description
All internal help page redirect links (*r301) used by ISL Light were migrated from http:// to https://. End users will now be directed to the secure version of help and sign-up pages when clicking links inside the application.
ISL Light - Desktop - Enforce customization domain or integrator key (FEATURE) [ISLLIGHT-7492] More
Description
ISL Light now sends the active customization name to the server during the connection handshake, so the server can verify that the customization is allowed for the user's domain or integrator before a session is created. If the server determines that the customization is not authorized, the user is shown the message "The provided customization is not authorized to be used in this session." and the session is blocked. When the server does not perform this check, behaviour is unchanged.
ISL Light - Desktop - Automatically save file when transferring without confirmation (FEATURE) [ISLLIGHT-7497] More
Description
Added a new File Transfer setting with three options: Show confirmation dialog, Save automatically and Save and open file location. The preference can also be set directly from the file transfer dialog by ticking "Don't ask me again" before pressing Save or Open folder. The previous Open button was renamed to Open Folder and now saves the file and opens its containing folder instead of opening it in a temporary location.
ISL Light - Desktop - Add customization support to iconize ISL Light (FEATURE) [ISLLIGHT-7498] More
Description
Added iconize customization to ISL Light. It can be set with command line: --on-load "customization?iconize=true". This command line will minimize the ISL Light window upon session start.
ISL Light - Desktop - Expose selected ISSC whiteboard tool in state (FEATURE) [ISLLIGHT-7501] More
Description
Improved handling of whiteboard tools in session.
ISL Light - Desktop - Add option to request total control in light session (FEATURE) [ISLLIGHT-7504] More
Description
A new Block Remote Input option was added to the Desktop dropdown in the ISL Light session toolbar, allowing the operator to take total control over a Windows remote computer by suppressing the remote user's local keyboard and mouse input. Once blocked, only the operator's injected input is processed, and the remote user can release the block locally by pressing Esc. The block is also automatically lifted when the session ends. The session status bar shows when the block is active, and the option is disabled or hidden when the feature is not supported by the remote OS or remote client version.
ISL Light - Desktop - Show "Join a Session" at Login page (FEATURE) [ISLLIGHT-7510] More
Description
ISL Light Login window was redesigned to allow joining a session directly from the start screen. The new layout shows Join a Session on the left and the operator Login form on the right, so a user can immediately enter a session code. The Session Code field is focused automatically and the Join and Login buttons are enabled only when their corresponding inputs are filled. Once a valid code is entered, the application transitions into client mode for the duration of the session, then returns to the main window when the session ends. The Join a Session window can be hidden on the first page by using command line arguments --on-load "customization?disable_join=true".
ISL Light - Desktop - Filter out QT_QUICK_BACKEND=software environment variable on Windows "grayscreen issue" (FEATURE) [ISLLIGHT-7517] More
Description
If the QT_QUICK_BACKEND environment variable was globally set to software on a Windows machine, ISL Light rendered text incorrectly and the remote streaming view appeared as a gray screen. ISL Light now forces the QT_QUICK_BACKEND and QMLSCENE_DEVICE variables to rhi on start-up, so the application renders correctly regardless of the user's existing environment configuration. The override can still be skipped by setting the ISL_QT_QUICK_BACKEND_SKIP environment variable.
ISL Light - Desktop - Auto-focus on the search bar when opening the flags window (FEATURE) [ISLLIGHT-7521] More
Description
The search bar in the flags window is now automatically focused when the window is opened, so users can start typing right away to filter flags without having to click into the search input first.
ISL Light - Desktop - Include send / receive buttons in File dropdown in ISL Light Client (FEATURE) [ISLLIGHT-7528] More
Description
Added Send Files and Receive Files buttons to the Files dropdown in ISL Light Client.
ISL Light - Desktop - Update string substitution in AON "start options" (DEFECT) [ISLLIGHT-5268] More
Description
Users experienced an issue where string substitution for ISL AlwaysOn start options did not work correctly. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - allows enabling restart and resume having 2 sessions in one process (DEFECT) [ISLLIGHT-7041] More
Description
Users experienced an issue when the operator selected "Join a Session" from the dropdown menu in ISL Light, the join mode was started inside the same ISL Light process. Functionality was redesigned, the client is now launched as a separate process.
The defect was fixed.
ISL Light - Desktop - Allow graceful termination (DEFECT) [ISLLIGHT-7059] More
Description
When ISL Light Client was started from a terminal on Linux and then closed normally, the terminal would show error messages even though no real error had occurred. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Change resolution in modal window does not display correct values in dropdown (DEFECT) [ISLLIGHT-7249] More
Description
Users experienced an issue where after changing the remote screen resolution in the Change resolution modal window, the change resolution dropdown did not show correct values. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Add customization support to disable ISL Light Client settings button (DEFECT) [ISLLIGHT-7430] More
Description
A new customization option was added to hide the settings button in the ISL Light Client window. When ISL Light is started with --on-load "customization?disable_client_settings=true", the client-side user will no longer see the settings button during a session, so integrators can prevent end users from changing client settings.
ISL Light - Desktop - Crash after logging in (DEFECT) [ISLLIGHT-7439] More
Description
Users experienced a crash of ISL Light application upon logging in and switching to Computers tab. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - New toolbar showing "Monitors" in dropdown when it should not be shown (DEFECT) [ISLLIGHT-7440] More
Description
Users experienced an issue where the Monitors item in the toolbar dropdown was shown where it should not be shown. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - No topbar on Linux when sharing screen (DEFECT) [ISLLIGHT-7484] More
Description
The topbar (hoverbar) was not visible on Linux when a client was sharing their screen. The window sizing logic in the topbar component was updated to set its minimum width and height when its dimensions change, ensuring the topbar is correctly displayed during a screen sharing session on Linux.
The defect was fixed.
ISL Light - Desktop - Incorrect state in toolbar (DEFECT) [ISLLIGHT-7487] More
Description
When a session started without remote control granted (operator could only draw) and the operator manually selected a marker tool, the toolbar state became inconsistent once remote control was granted later. The toolbar state is now forced into a consistent state when control is granted during an active session.
The defect was fixed.
ISL Light - Desktop - New toolbar icons cut off when moving session window between screens with different DPI (DEFECT) [ISLLIGHT-7488] More
Description
When the session window was moved between monitors with different DPI scaling, toolbar icons and icons in the computer and session lists could appear cut off or visually mangled. The icon components now adapt to DPI changes correctly, so icons remain properly rendered when the window is dragged between displays with different scaling. On uneven DPI values (e.g. 125%) a 1px rounding difference may still occur.
The defect was fixed.
ISL Light - Desktop - Session still gets started if SOS dialog is cancelled (DEFECT) [ISLLIGHT-7489] More
Description
When the SOS dialog was shown before starting a new session, accepting or cancelling the dialog had the same effect - the session would be created in either case. SOS dialog handling was redesigned, cancelling the dialog will now correctly abort session creation, while accepting it will continue to start the session as expected.
The defect was fixed.
ISL Light - Desktop - New toolbar shows two lines when command line argument hide_recording=true is used (DEFECT) [ISLLIGHT-7495] More
Description
When ISL Light was started with the customization argument hide_recording=true, an extra line separator was visible in the Session toolbar dropdown where the Start Recording button used to be. The separator visibility is now tied to the visibility of the Start Recording button, so only a single separator is shown when recording is hidden.
The defect was fixed.
ISL Light - Desktop - Operator is not warned before revoking control (DEFECT) [ISLLIGHT-7500] More
Description
When an operator clicked Revoke Control in the client topbar or chat window, control was revoked immediately, so a misclick could cause the operator to accidentally lose remote control. A confirmation dialog is now shown before control is revoked, asking the user to confirm the action before it takes effect.
The defect was fixed.
ISL Light - Desktop - Keyboard shortcuts need to be pressed twice to work (DEFECT) [ISLLIGHT-7503] More
Description
Users experienced an issue where the keyboard shortcuts had to be pressed twice in order to work. The cause was that the shortcut was being registered both by the menu item and by its associated action, so the first key press was treated as ambiguous. Shortcut handling was reworked so only one of the two components registers the shortcut, and shortcuts now work on the first press.
The defect was fixed.
ISL Light - Desktop - Unlocatable Move Topbar button in Session Topbar (DEFECT) [ISLLIGHT-7506] More
Description
The draggable area of the session topbar used to move the topbar around the screen could not be located by accessibility tools, which made it impossible to find or interact with for accessibility-driven workflows. An accessibility name Move Topbar was added to the drag area of the "Sharing screen" topbar and to the hidden toolbar shown when viewing a screen, so the element is now properly exposed to accessibility tools.
The defect was fixed.
ISL Light - Desktop - Operator cannot request control in session (DEFECT) [ISLLIGHT-7511] More
Description
Users experienced an issue where an operator was not able to request control in session after remote control was revoked. Functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Dragging a computer on computers tab when non default columns are selected results in broken gui (DEFECT) [ISLLIGHT-7513] More
Description
In the Computers tab, when the user enabled additional non-default columns and then started dragging a computer item, the drag visual was rendered incorrectly and the UI appeared broken. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Disable "Enable Peek" in "Performance Options" to fix black screen issue (DEFECT) [ISLLIGHT-7515] More
Description
Users experienced an issue where the black screen feature did not fully hide the screen content when Aero Peek was enabled on the remote computer. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Uptime not calculated correctly for uptimes more than 48 days (DEFECT) [ISLLIGHT-7522] More
Description
When System Info was viewed for a machine with an uptime longer than approximately 48 days, the reported uptime value was incorrect because the underlying counter overflowed. The uptime calculation was switched to a wider 64-bit counter so it now reports the correct value regardless of how long the machine has been running.
ISL Light - Desktop - Mouse clicking on the remote computer still works when Total control enabled (DEFECT) [ISLLIGHT-7523] More
Description
Users experienced an issue where "Total Control" did not work correctly when connected to windows computers, users were able to perform left and right mouse clicks even though control was disabled. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed
ISL Light - Desktop - User can not resize viewer when viewing remote screen after joining session in new ISL Light Join mode (DEFECT) [ISLLIGHT-7525] More
Description
Users experienced an issue where they were unable to resize viewer when they were viewing rmeote screen after joining session in new ISL Light Join mode. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL Light - Desktop - Computer history not working due to qml error (DEFECT) [ISLLIGHT-7531] More
Description
Users experienced an issue where Computer history did not work due to a QML error. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL AlwaysOn - Desktop - Session history is missing session end information (FEATURE) [ISLALWAYSON-2046] More
Description
The session history in ISL AlwaysOn was missing detailed events about successful sessions, so completed sessions could appear as failed in the Access History even when they had ended normally. Four new history events (session_start, session_connected, session_reconnect, session_end) are now written into sessions.xml, so the Overview window correctly reports the state and full lifecycle of each unattended session, and existing entries remain readable for backwards compatibility.
ISL AlwaysOn - Desktop - Migrate code http://*r301 links to https://*r301 AKA safe help page urls (FEATURE) [ISLALWAYSON-2052] More
Description
All internal help page redirect links (*r301) used by ISL AlwaysOn were migrated from http:// to https://. End users will now be directed to the secure version of help pages when opening links from the About dialog and other places inside the application.
ISL AlwaysOn - Desktop - Post more info when installing and granting computer connection (FEATURE) [ISLALWAYSON-2054] More
Description
Added support for collecting and forwarding rich invocation context when granting access in ISL AlwaysOn. At startup it gathers the Windows session ID, sanitized command-line and the contents of startup_info.txt. (written by the launcher) into an invocation envelope. This enveleope is transmitted via IPC between ISL AlwaysOn instances and included in the grant request to the server, enabling traceability of how the granting client was originally delivered and launched. Setup check additionally sets the ISL_SETUP_CHECK environment variable so ISL AlwaysOn can read the setup check parent's own startup_info.txt and include it in the envelope.
ISL AlwaysOn - Desktop - Uptime not calculated correctly for uptimes more than 48 days (DEFECT) [ISLALWAYSON-2056] More
Description
When System Info was viewed for a machine with an uptime longer than approximately 48 days, the reported uptime value was incorrect because the underlying counter overflowed. The uptime calculation was switched to a wider 64-bit counter so it now reports the correct value regardless of how long the machine has been running.
ISL AlwaysOn - Desktop - Mouse clicking on the remote computer still works when Total control enabled (DEFECT) [ISLALWAYSON-2057] More
Description
Users experienced an issue where "Total Control" did not work correctly when connected to windows computers, users were able to perform left and right mouse clicks even though control was disabled. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.
ISL AlwaysOn - Desktop - Disable "Enable Peek" in "Performance Options" to fix black screen issue (DEFECT) [ISLALWAYSON-2059] More
Description
Users experienced an issue where the black screen feature did not fully hide the screen content when Aero Peek was enabled on the remote computer. The functionality was redesigned and the issue is no longer reproducible.
The defect was fixed.