I don't know what's the matter with that- When I have time later tonight, I'll try and figure out what's the deal- Everything is set up just fine as far as I know of! I have also noticed this problem with a few other people as well... Hmm... If you send me the URL I will just take the avatar and place it in the "Do not use" category, then you can use it from there and it will definitly show up!
Hope I helped,
-Kera-
If anyone else has this problem, Send me the URL's or just the file of the avatar you want to use to my email:
SilverMoon@JapanSylvian.com
And I will make a seperate gallery for all of your avatars!