PRO DC - Only some of first page of pdf displaying properly

Hi,

PDFs are Pro Dc arent displaying properly. Most the first page of the pdf. Images show, but not blocks of colour or text. When viewing in review on Mac I cans ee the of is all there.

The problem isn't limited to just open pdf - but lots.

My other half played around with my adobe setting son the weekend so that might have something to do with it. 

I've followed a post about clearing preferences, but half the files listed in that weren't on my system.

Can anyone help please?