Known issues

The Citrix Virtual Apps and Desktops 7 1906 release contains the following issues. (Components and features that are documented separately have their own known issues articles.)

This warning applies to any workaround that suggests changing a registry entry:


Editing the registry incorrectly can cause serious problems that might require you to reinstall your operating system. Citrix cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. Be sure to back up the registry before you edit it.

Install and upgrade

  • If you already have Universal Print Server (UPS) version 19061022052 installed, upgrading UPS using the 1906.2 metainstaller does not add any new UPS functionality. After the upgrade, only the Universal Print Server version number, in Programs and Features, is changed to 19062022068. [HDX-20674]

  • If you already have Session Recording version 19061022052 installed, the following issues occur when you run the 1906.2 metainstaller:

    • The user interface message stating that Session Recording is ‘included in upgrade’ is incorrect. The Session Recording components on the 1906 and the 1906.2 ISOs are actually identical, and no upgrade is available.

    • If you do opt to ‘upgrade’ Session Recording with the 1906.2 metainstaller, a list of currently not-installed Session Recording components is offered for you to install instead. (Already installed components are not listed.) If you install any of these additonal components using 1906.2 metainstaller, the Session Recording version number, in Programs and Features, is updated to 19062022068.


  • Upgrading the VDA to version 1906 automatically installs the new MCS I/O driver if it was not previously installed. As a result, target devices fail to boot in read only mode. Citrix recommends that you do not install updated MCS I/O functionality and Citrix Provisioning in the same Windows environment. [PVS-4151]

  • Uninstalling a VDA might fail with the error “Citrix Telemetry Service - x64 failed to install, with internal error code 1921, failing action was “StopServices”, on operation “ServiceControl”. As a workaround, run the VDA Cleanup Utility. [XAXDTELE-457]


  • When you start an application from StoreFront, the application might not start in the foreground, or the application is in the foreground but might not have focus. As a workaround, click the icon in the task bar to bring the application to the front or in the application screen to bring it to focus. [HDX-10126]

  • After installing the Skype for Business Web App Plug-in, webcams might not be enumerated and meeting pages on Firefox might not refresh automatically. [HDX-13288]

  • When you connect to a new session, disconnect, and then reconnect to the same session, your desktop icons might flicker. As a workaround reset the user profile, log off the session, and log on again. [HDX-15926, UPM-1362]

  • When you disconnect a Surface Book laptop from a Surface Dock, and then reconnect it, the external mouse and keyboard might not function. This issue might occur with Windows 7. [HDX-9067]

  • When using Windows 10 1809 LTSC, VCLibs dependencies fail to install. [HDX-16754]

  • Performance counters might not display in the “Available counters” list during a session. [HDX-17017]

  • Copy and paste items from different parent directories are not supported. [HDX-18630]


  • If you have upgraded to Director 7 1903 or later from any previous releases and not cleared the browser cache (not selected the ‘Disable cache’ check box), custom reports previously created are lost and Director displays an “Unexpected Server error” on the Custom Reports tab. Differences in UI design between previous and current versions of Director can cause this issue. Disable cache and perform a hard refresh to view old custom reports and create and view new custom reports. [DIR-7634]


  • The XenCenter console might display a blank screen after disconnecting a XenDesktop session. As a workaround, send CTLR+ALT+DEL to the XenCenter console to make the console screen appear. [HDX-17261]

  • DPI might not match during a session running on Windows Server OS 2016 or 2019 when the DPI is changed on the client and the session is reconnected. As a workaround, resize the session window to match the DPI. [HDX-17313]


  • Universal Print Server printers selected on the virtual desktop do not appear in the Devices and Printers window in Windows Control Panel. However, when users are working in applications, they can print using those printers. This issue occurs only on the Windows Server 2012, Windows 10 and Windows 8 platforms. For more information, see CTX213540. [HDX-5043, 335153]

  • The default printer might not be marked correctly in the printing dialog window. This issue does not affect print jobs sent to the default printer.[HDX-12755]

Citrix Scout

  • Run Citrix Scout health checks only from a Delivery Controller. Running Scout on a VDA, StoreFront, or Citrix Provisioning component is not supported. [XAXDTELE-231]

  • Run only one instance of Citrix Scout health checks at a time. Otherwise, health checks might fail with a message about files being used by another process. [XAXDTELE-232]

Third-party issues

  • An issue in Microsoft Windows 10 version 1809 might cause slight erratic behavior when using the Surface Pro and Surface Book pen. [HDX-17649]

  • Because of a recent change in a Microsoft default setting, the hardware encrypted USB mass storage devices redirected using generic USB in RDS environments might fail for non-administrator accounts. Change this behavior by editing the local policy setting on the VDA. Use the local Group Policy editor to select Computer Configuration > Administrative Templates > System > Removable Storage Access and enable the policy All Removable Storage: Allow direct access in remote sessions. [HDX-16480]

  • A VDA running on Azure might freeze when using Enlightened Data Transport (EDT), requiring a session reconnect. As a workaround, set udtMSS=1400 and OutbufLength=1400 in Azure environments. For more information, see CTX231821. [HDX-12913]

  • In browser content redirection, after starting a YouTube video using the YouTube HTML5 video player, full-screen mode might not work. You click the icon in the lower-right corner of the video, and the video doesn’t resize leaving the black background in the full area of the page. As a workaround, click the full screen button, and then select theater mode. [HDX-11294]

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