I'm having the same problem. Upon entering the information, it says the profile has been updated, then the page will refresh again and say
There Was A Problem With Your Details
You must choose a UserName
You Must give an e-mail address
You Must enter a valid e-mail address
Sometimes with internet forms you have to reenter the information, even if it's already filled out; but of course the UserName field is uneditable.
In any case, I just wanted to give another head to the count of the avatar selection not working properly.