Citrix Virtual Apps and Desktops

Known issues

  • The Citrix Virtual Apps and Desktops 7 1912 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]

  • When you run the Citrix Virtual Apps and Desktops metainstaller, on the Diagnostics page if you click Connect without first selecting Collect diagnostic information, after you close the Connect to Citrix Insight Services dialog the Next button is disabled and you cannot move to next page. To re-enable the Next button, select and immediately deselect Collect diagnostic information. [XAXDINST-572]

  • If you upgrade Studio from XenApp and XenDesktop 7.15 LTSR (7.15 Studio) to Citrix Virtual Apps and Desktops 7 1912 LTSR (1912 Studio), then uninstall 1912 Studio and reinstall 7.15 Studio, Studio fails to launch with error “‘Cannot load windows PowerShell snap-in PvsPsSnapIn error’” To solve this issue, before reinstalling 7.15 Studio, manually delete PvsPsSnapIn.dll under C:\Program Files\Citrix\PowerShell SDK. [XAXDINST-610]

  • If you request a list of valid options for the XenDesktopServerSetup.exe command, the /no_webstudio option is listed. This option is for internal use only. Do not use it.


  • When MCS creates non-persistent machines in AWS, the DeleteOnTermination flag is set to True. However, upon power cycling, MCS re-creates new EBS volumes and swaps it with the old one which changes the DeleteOnTermination flag to False. [PMCS-4953]

  • Users reconnecting to a session on Windows 2019 VDA might experience a gray screen. [HDX-21804]

  • In Citrix Hypervisor, after installing a new VDA the Citrix Desktop Service erroneously sets the XenTools registry value to UTC. The service does not verify the system time, leading to a connection failure resulting in machines existing in an unregistered state. This issue is temporary. The VDA corrects the system time when it synchronizes from various sources. The current fix sets the XenTools registry value to UTC only if the operating system time is UTC, resulting in no mismatch. [PMCS-5425]

  • If you use the hypervisor to delete a virtual machine provisioned using Citrix Virtual Apps and Desktops, you may not be able to add the machine to the catalog because the base disk is also deleted as part the virtual machine deletion process. [PMCS-8591]

  • Using a template to provision a catalog is considered an experimental feature. When using this method, virtual machine preparation may fail. As a result, the catalog cannot be published using the template. [PMCS-602]

  • If you try to add a protected app to your Favorites, this message might appear, “Your apps are not available at this time…” When you then click OK, this message appears, “Cannot add app.” After you switch to the Favorites screen, the protected app is listed there, but you can’t remove it from Favorites. [WSP-5497]

  • Each time you upload a compressed file using Citrix Workspace app for HTML5 on an end-to-end SSL using either Chrome or Safari browser, session reliability might start, eventually creating an unusable session. To resolve this issue, relaunch the session. To re-enable file transfer, log off from the current session. [HDX-22106]

  • 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 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]

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

  • The combo box might not display properly when a user selects a combo box that is already in focus on the host. As a workaround, select another UI element and then select the combo box. [HDX-21671]

  • You have enabled Local App Access. If you start a Windows 2012 R2 VDA session, disconnect and reconnect the session, and then start a local application and maximize it, the VDA taskbar might truncate the application. [HDX-21913]

  • When both IPv4 and IPv6 addressing is configured in your network, resources in a delivery group may not be accessible when the delivery group uses a Broker Access Policy rule configured to allow IPv4 address filtering only. To ensure all resource filtering behaves as expected, configure the Broker Access Policy rule to include both client IPv4 and IPv6 addresses. [WADA-7776]

    For example, to set rules allowing IPv4 and IPv6 addresses via ‘direct to StoreFront’ and ‘Citrix Gateway’ access, use PowerShell such as:

     Set-BrokerAccessPolicyRule -Name "Apps_Direct" -IncludedClientIPFilterEnabled $True -IncludedClientIPs @("","2001::3")
     Set-BrokerAccessPolicyRule -Name "Apps_AG" -IncludedClientIPFilterEnabled $True -IncludedClientIPs @("","2001::3")

    To confirm a rule, use PowerShell such as:

     Get-BrokerAccessPolicyRule -Name "Apps_Direct" | Select Name,IncludedClientIPFilterEnabled,IncludedClientIPs

    This returns the following when the rule is correctly set for IPv4 and IPv6 addresses:

     Name         IncludedClientIPFilterEnabled IncludedClientIPs
     --                  --------------------------- -----------------
     Apps_Direct                          True {, 2001::3/128}


  • In some cases, the virtual machine’s power state appears as unknown even if it appears registered. To resolve this issue, edit the registry key HostTime value to disable time synchronization with the host:




The default value is HostTime="UTC". Change this value to something other than UTC, for example, Local. This change effectively disables time synchronization with the host. [BRK-4187]


  • The Console link on Citrix Director > Machine Details does not launch the Machine Console in the Microsoft Edge 44 and Firefox 68 ESR browsers. [DIR-8160]

  • 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]


  • Setting the policy View window contents while dragging to Prohibited does not work on ESXi and Hyper-V. [HDX-22002]

  • If you start a video preview using a 64-bit webcam app over Theora compression, the session might crash. [HDX-21443]

  • Skype Universal Windows app (UWA) launches with a black background. In some cases, this background occupies the client’s entire screen. [HDX-22088]

  • In some cases, an application may launch in the background while another application is currently in focus. As a result, local window ordering is lost. [HDX-21569]

  • 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 Multi-session 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]

  • These issues apply to ADM hardware encoding. [HDX-20476]:

    • Pixelation might occur when using Citrix Workspace app for Windows. As a workaround, make the following registry setting on the client that has Citrix Workspace app for Windows installed:

      HKEY_LOCAL_MACHINE\Software\Citrix\ICA Client\Engine\Configuration\Advanced\Modules\GfxRender (32-bit)

      HKEY_LOCAL_MACHINE\Software\Wow6432Node\Citrix\ICA Client\Engine\Configuration\Advanced\Modules\GfxRender (64-bit)

      Name: MaxNumRefFrames

      Type: DWORD

      Value: 5

    • You might see less than optimal performance when using 4k resolution. This issue causes a frame rate of only 7–10 frames per second. Also, encoding time increases.
    • Video stutter might occur for the first two to five seconds of the video when using the Selective H.264 graphics mode. RapidFire SDK is not designed for this use case.


  • 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]


  • App-V applications may fail to start if more than 100 applications are published in a single Delivery Group. To increase this limit, use the MaxReceivedMessageSize property on the appropriate binding element to increase Max Receivable message size. Do this in the configuration of the Delivery Controller and/or the Broker Agent on the VDA. [APPV-11]

Third-party issues

  • Chrome supports UI Automation only for toolbars, tabs, menus, and buttons around a web page. Because of this Chrome issue, the automatic keyboard display feature might not work in a Chrome browser on touch devices. As a workaround, run chrome --force-renderer-accessibility or you can open a new browser tab, type chrome://accessibility, and enable Native accessibility API support for specific or all pages. In addition, when you publish a seamless app, you can publish Chrome with the --force-renderer-accessibility switch. [HDX-20858]

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

  • A VDA running on Azure might freeze when using Enlightened Data Transport (EDT), requiring a session reconnect. As a workaround, set edtMSS=1350 and OutbufLength=1350 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