I just downloaded and installed C&C95, and I keep getting this issue. I followed the instructions found here, https://forums.cncnet.org/topic/8821-cc-1-tiberian-dawn-installation-on-windows-10/ When playing, I load up the first mission, and when I go to scroll the screen, it makes a picture in picture effect, and I can no longer scroll in any direction, and cant even command my units half of the time. The only resolution that seems to work is the lowest one, 640x400.
I'm running the game on Windows 10 64.