Hey there! I realize you guys just rolled this new, sweet forum out and the Steam link was a even a tad later than that. BUT!
I am having a slight issue in being able to change my avatr or any of my forum preferences on this page: http://forums.spiralknights.com/en/user/105831/edit
My account was originally a web account from the Preview, but I have since converted it to a Steam account. Here's the issue I have:
The top box here: http://i130.photobucket.com/albums/p262/DirtTB/Spiral%20Knights/fak.jpg
It's empty. I'm not sure if this is so for everyone or not, but it is not for me. Regardless, if I try to change any of the other info on the page (avatar, timezone, language) I am presented with this message: http://i130.photobucket.com/albums/p262/DirtTB/Spiral%20Knights/faak.jpg
I don't know if anyone else is having this problem, but I spoke with Dogrock in the IRC and he hadn't seen anything on it so far.
UPDATE: I have fixed it!
I deleted all my Spiral Knights cookies and logged out and in and voilà!
Found the solution thanks to Zefyr here: http://forums.spiralknights.com/en/node/26143#comment-151929