Video Display has the bottom missing

Using F8 to display video, the bottom approx. 10% of the video is missing so for example if I record a Youtube clip with subtitles turned on, I will not see the subtitles or only see the top part of the words if they happen to be high enough on the screen.
On exporting, the whole screen displays correctly, it’s just the display window but I have a project where I want to be able to read the subtitles whilst recording my own audio over it.
Does anyone else have the same issue please so I know whether to put an error report in to Steinberg?
I’m still on 12.0.0 as had major issues with later versions for audio connections saving and with Sonarworks SoundID reference, so maybe this video issue is fixed since?