Congrats on the upgrade, it looks good!
Regarding functionality, I've noticed that when doing a search the default sorting order for the results is by relevance. That's different from the old behavior. It's not necessarily a bad thing, but for the FS/FT forums I think it is. When I'm doing a search over there I'm interested in the latest offerings/requests. Seeing a For Sale topic from 2007 on the first page of the search results is of no value to me, the item is probably long gone by now.
I hope we can return to the "last posting date" order, at least on that area of the forum.
Another issue is "my" avatar. I'm not sure if this is related to "Some avatars are missing" but mine is... well not mine. I didn't have an avatar before so I'm not sure why I have one now.