Thanks for the links.
The good news is that the images aren't missing and should be displayed properly for One Click Pass members.
The bad news is that you may have found a bug.
I'll have a tech guy look into it this weekend. It seems like the images you cannot see are the vidcaps that are smaller than the default thumbnail size. So technically the forum software is trying to display the the full sized image in the post.
So to answer your question, this isn't be a problem for One Click Pass members. The images do exist.
Just out of curiosity, if you log out of the forums and then try to view those threads as a guest (not logged in) are the images still broken?
Thanks,
Alex