Mm, I see the problem, Baron Corm. The photobucket album Kymme uploaded it into has a space in the title, that's what's led to the '%20' in the URL.
The forum doesn't like spaces in the album name. That's the short of it. You could rehost it on your own photobucket account, in an album without a space in its name, like I see other people with Kymme avatars have done.
Apart from letting Kymme know and change the folder, that's really all that can be done. Sorry.
(Source: Rawhide, personal experience)