Cant seem to recreate it with any attachments.
Its odd because they only show up very briefly after clicking "Save Changes" button and you get the "Thank you for updating your profile page".
Code:
http://www.myforum.com/forum/profile.php?do=updateavatar
But when it redirects back to the edit avatar page the errors are gone and the avatar changes successfully.
So other then seeing them during that process I see no ill affects.