Ah, okay, easy.
The URLs that are in the beginning of that thread are from the old server's Avatars and are trying to show similies that don't exist there any more since the translation from the old server to the new in May 2006 didn't support them.
The later URLs where Rick tried to post some pictures don't work as Rick used the Google Image Search feature, and then used the Google URL instead of the "real" URL to the picture. In laymen's terms, he didn't upload the photos to GT40s.com but linked to outside photos that don't exist at that URL anymore.
No problem with the forum, or your login, or anything you are doing wrong.
Ron