I'm using the Cloudberry Remote Assistant v2.1.0.25. Connecting from Windows 10 (1803) to Windows 10 (1809) . When I start my PowerShell ISE on the remote computer I basically get a black box. If I do an ALT-F I get the File menu and I can browse to my folder with my scripts. When I open the script, it goes back to a plain blank box. I also have a similar problem when opening RDP on the remote computer RDP session opens and I get a blank box.
It seems that it might be related to your display driver, i have just reproduced it on few different machines and wasn't able toget similar results, here are few screenshots as a proof: