Cubase Video pixilates

Video pixilates into coloured pixels…It happens every couple of seconds…unable to use video with Cubase 10.5 or 11. Video plays fine on same computer in everything except cubase…

You may have to look at file format or how your computer is performing when you are playing as with Cubase open you are doing more than just playing the video. I have 10.5 and never see this problem

Tried on 3 computers, all play vids back fine except in cubase. Also tried MP4, Quicktime, V2CACHE, WMV, all the same every few seconds they pixelate (lots of colours)…