Make sure you are reading the messages on the user profile page:
"Your sig/avatar image
is not hosted on an approved image hosting site. Please check both
"Signature and avatar images must be hosted on an approved image hosting site. At this time, the following sites are approved: imageshack.us, photobucket.com, flickr.com, imgur.com and tinypic.com."
I peaked at your profile and saw both avatar and sig image field populated...both need to be correct.
This post was edited on 2/24 at 12:49 pm