After upgrade my remote desktop screen is full of vertical lines. The attached screenshot shows an example that's not too bad but this happens in all applications, and on the desktop/taskbar. Lots of...
I had the same problem with grey-colored bars and going back to 10.8.1 corrected this issue.
For some of our servers, I received an error code 0x4 when connecting to Windows Server 2008 Enterprise servers.
Event logs on the Windows Server 2008 Enterprise servers indicated the RDP login was successful and was immediately followed by a logoff condition. No errors were recorded on the Windows servers.
The grey-colored bars and error code 0x4 issues were corrected by moving back to 10.8.1.
My client is macOS Big Sur ( 11.7 ).