Cubase is displaying video files zoomed in, with a lot of the outsides cut off. It looks like that any which way I resize the window. I included two pictures: One of a shot of text in Cubase, and one of the same text simply playing in Windows Media Player for comparison.
Did you manage to resolve this? I have the same problem.
It seems Cubase doesn’t handle 4K video very well. I used a video converter to downgrade the video to standard 1080 and it worked fine.