Not sure if this is related, but I’ve been getting this on and off since a few hours:
Refreshing the page once or twice fixes this, but have never seen this before.
Only happens when you are not logged in (as far as I can tell).
Funny thing: Scrolling down does refresh the page (lines, not content).
And, yes, I have cleared my cache/cookies.
EDIT: Also, since a few days: The uploaded images do not behave a lot of the time, need to re-upload to fix that (expanding/showing info, that stuff).