Adobe DC shows negative colors on images (white shown as black)

Hi All

I have been using DC for the past year with no issues but as of today it has started to invert the whites in images to a black color, resulting in the images becoming un-view-able (see attached). The files still look fine when viewed with a different PDF viewer so it doesn't seem to be the files or graphics card. All PDFs have this issue (created from Word, Illustrator, etc.).

I have done a reinstall and a repair and checked for updates. I've also checked the Edit-Preferences-Accessibility background color options.

What can I do to fix this? Currently DC is unusable for image rich files.

Thanks

Andrew