..just that I've experienced personally in the last 10 minutes. Let's count:
Logged in as somebody else (2 different people!)
Showing the notifications from one of those two when that was fixed.
Out-of-sync logged in/not logged in between sidebar and post
Possibly related to that, hiding my post tools
Failing to post my message and genuinely not posting it
Failing to post a message and actually posting it
Signing me out at random and then back in
Arbitrary hiding of individual posts
Clicking through to a post when I tried to just recommend
Holding notifications (not clearing)
Failing to cursor lock (so hitting backspace goes back a page).
Okay, that's about a *full* dozen. Kinja, what in the actual fuck?