Since update to 8.2, I have noticed that preview in fullscreen shows wrong colours. If the cursor is on the menu bar all is ok. If the cursor moves onto the image then yellow shows as blue, blue shows as orange. This is only in fullscreen not ordinary preview. Can anyone else see this behaviour, or is it just me?
Ok, so when I went to create a screenshot to demomstrate the problem, thee problem has gone away, after 2 days of misbehaving!
German has a specific word for this: Vorführeffekt. 