The vendor has published 1 unique mention(s) for this bug: 1. The combination of H.264 lossless compression and YUV444 software encoding is supported on Citrix Workspace app for Windows only. When you open desktop sessions and use other Citrix Workspace apps with the combination, a gray screen appears. To work around the gray screen issue, run the following command on the Linux VDA: /opt/Citrix/VDA/bin/ctxreg create -k "HKLM\System\CurrentControlSet\Control\Citrix\Thinwire" -t "REG_DWORD" -v "VideoLossless" -d "0x0" --force Latest urls for this bug: 1. https://docs.citrix.com//en-us/linux-virtual-delivery-agent/2305/whats-new/fixed-issues 2. https://docs.citrix.com//en-us/linux-virtual-delivery-agent/2305/whats-new/known-issues