Known issues

The Citrix Virtual Apps and Desktops 7 1808 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

  • An intermittent (observed when the Windows CEIP process runs nightly) StoreFront upgrade issue occurs during an upgrade from a 7.12 of later Delivery Controller. The following message is displayed:

    “StoreFront cannot be upgraded because the following program is using some files. Close the program and try again. Program name: CompatTelRunner”

    To work around this issue, follow the instruction in the message. [DNA-51341]

  • 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]


  • After upgrading to version 1808.2, Studio might display the following message when viewing a Delivery Group’s details pane, when editing a Delivery Group, or in the Configuration > StoreFront display: "Could not load file or assembly ‘Citrix.Diagnostics.Tracing. Version= ... The system cannot find the file specified."

    For a workaround, see CTX237904. [STUD-3339]

  • A stop error (blue screen) is intermittently observed during the installation of a 7.16 VDA on a Surface Pro 3 or 4. During installation, the Intel driver igdkmd64 stops responding. This is a third-party issue that impacts Intel GPUs: Intel 5000 HD, and Intel Iris 530. [HDX-12662]

  • 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]

  • Multicast might fail to display video when using Citrix Receiver for Windows newer than version 4.6. Audio is still available. As a workaround, add this registry key on the endpoint:

    Name: DisableVMRSupport Type: DWORD Value: 4 [HDX-10055]

  • 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 playing a video in full screen mode with H.265 selective encoding enabled, the video might become corrupted and on certain occasions, sessions might disconnect. As a workaround, disable H.265 encoding. [HDX-14363]

  • You install an audio device on your client, enable audio redirection, and start an RDS session. The audio files might fail to play and an error message appears. As a workaround, add this registry key on the RDS machine, and then restart the machine:


    Name: EnableSvchostMitigationPolicy

    Type: REG_DWORD

    Data: 0 [HDX-15791]

  • 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]


  • 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

  • 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]

Known issues