I'm saying it remembers the former avatar dimentions and the database doesn't get updated if you don't "upload" an avatar or pick a stock avatar. So it uses whatever size it has for that user in the database.
48x48 seems like the dimention to a "stock avatar". So if you change from a stock avatar to one you're just linking to, you'll need to override the dimentions.
You need to run that query I posted to adjust the avatar size for the user. <img src="https://www.ubbcentral.com/boards/images/graemlins/wink.gif" alt="" />
