Friend and clan post backgrounds still work, just not my own, to me.
Things I've noticed (will try to keep an eye out for other things that pop up):
• Avatar next to reply box at the bottom isn't showing custom, neither is the new one at the top left of the page, but that's just tiny and might as well leave it.
• Using the refresh button at the bottom of the thread causes the final positioning to be off a little. For example on this thread (at 5350 posts), I end up with: HTTP://puu.sh/bAaZO.png
E: This doesn't happen on page 536 at the moment, maybe its due to images or the Twitter embedding?
• This button http://puu.sh/bAbkH.png is scrolling right down to the bottom of the page for me.
• For some reason, on page 536, you have 2 icons beneath your avatar:
HTTP://puu.sh/bAd8C.png This seems to be inconsistent, and when hovering the mouse over the RS-Linkify one, gives the 'Gold Premier Club Member' message.