I go not have Gravitar so I know the 'upload image' used to work..
@Hunter I tried to change my profile pic as a test by uploading a new pic and got the same as you @nikita - Upload Failed! Error was: Missing a temporary folder.
I got that same message yesterday ("missing a temporary folder"), but I thought maybe it was because I was trying from my cell phone (the first time I uploaded a pic I did it on my desktop).