Citrix Virtual Apps/Desktops 1912 LTSR - Black boxes appear around/behind published applications on Windows Server 2016
Article ID: CTX279556
Updated On:
Description
Users may see black background window appear for a short time when creating, closing, moving or resizing a seamless window
Example 
Resolution
This is a known limitation with seamless .
As a work around customer can try to use published app as non-seamless mode (TWIMode=Off) but the user experience might not be same as seamless mode.
Problem Cause
This is known limitation due to the asynchronous nature of seamless virtual channel and graphic virtual channel.
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