My issue is that preview is no longer rendering text properly, everything is very blurry with some pages being unreadable. This happens across multiple PDFs, so it's not tied to just one. Strangely, if I set it to single page mode and then proceed swipe up/down slowly, showing moving to the next page, both the current and the next page render perfectly fine.
This is that what the text should look like:
This is what the text actually looks like in a best case scenario.
By the way, I have a 2013 15" rMBP.
Best Answer
As per the discussion above, changing the scaling to the default setting and back seems to fix the issue.