I am now having the same problem. I want to change my avatar but when I go to upload it from my computer, I get a blank screen and this as the web address: http://www.wnff.net/index.php?action=profile2.
Can you post the picture you were trying to upload so I can try it? I just want to make sure it's not a problem with the upgrade.
Please note that I don't think the forum will take any uploads larger than 2 MB.