Windows Server 2008 R2 which is used primarily to run MS Access for browsing and manipulating various databases.
OS Name Microsoft Windows Server 2008 R2 Standard Version 6.1.7601 Service Pack 1 Build 7601 OSX Remote Desktop v8 and 10.3 MS Access 16.0.12026.20194
The problem happens on the right 33% of the display, but once it's garbled moving the application window to the left doesn't fix it, it stays garbled.
Update: The problem appears to be related to Microsoft's RDP client for MacOS. We installed the iTeleport and all works fine.