[Citrix Receiver 13.8 Seamless Windows on Wayland Session]

I'm experiencing the same issue on Linux workstations, with XenApp 6.5 the borders didn't appear.  Just migrated to XenApp 7.15 and noticed the difference.

Another issue i've seen is that the application don't  stack correctly on the taskbar so all applications appear under one application on the taskbar.

 

Created a support ticket for this issue with Citrix Support.

[VDA 7.12 Volume Control]

The solution works, but we have some problems with our PVS image to get this working, if the Citrix Audio Redirection Service restarts, the volume mixer is broken again. And you need to set the permissions again.

We're running XenApp 7.11 on Server 2016