Known issues

The Citrix Virtual Apps and Desktops 7 1903 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

  • When installing a Controller and you select I want to connect to Smart Tools and Call Home on the Smart Tools page of the installation wizard, Call Home might not be enabled. As a workaround, either use the schedule feature in Citrix Scout or enable Call Home using PowerShell. [CAM-9907]

  • Error message after partial upgrade from 1808.2: After upgrading a Controller that also has Studio installed (but other Controllers aren’t yet upgraded), Studio might display “An unexpected error occurred” when an administrator requests machine catalog or Delivery Group details. After all of the Controllers are upgraded, the message does not appear. [BRK-2652]


  • 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]

  • Installing the VDA with MCS I/O on a provisioned virtual disk causes the target to stall when booting the VM to format the write cache disk. Upgrading the VDA to version 1903 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-4217]

To uninstall the machine identity service agent for MCS, use the following command:

MsiExec.exe /X{D945C515-56F6-49AB-A019-9423893E5021}

MsiExec.exe /X{2DAFC714-A564-4ECD-9483-EC98EE082EC9}
  • 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]

  • Upgrading the VDA to version 1903 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]

  • If you are running the latest version of Citrix Files for Windows (4.5) on a virtual desktop on Windows Server 2019, the first logon (with a new profile) to the virtual desktop may present a black screen. To work around this issue, restart the desktop, or launch the task manager using CTRL+ALT+DEL and start File Explorer (explorer.exe) as a new task. This issue does not occur if you are working with the version of Citrix Files for Windows (4.2) that is shipped with Citrix Virtual Apps and Desktops 7 1903. [SFWIN-2185]


  • When using Windows 10 1607, disconnecting from the session might not work correctly. [HDX-13448]

  • 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]

  • When using Windows 10 1809 Enterprise VDA, the disconnect button might not work correctly. [HDX-17150]

  • 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 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]

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


  • 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 Knowledge Center article 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]

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]

  • When a server or workstation has just over 2000 disconnected sessions before being restarted, the server doesn’t allow you to reconnect. This issue also occurs if you use Remote Desktop Session Host (RDSH)/Remote Desktop Protocol (RDP) to connect. This issue is due to a Windows Server 2019 and Windows 10 version 1809 problem. As a workaround, restart the server or workstation. [HDX-16186]

  • 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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