Picture attachments aren't visible at all unless you're signed in. I believe that you should be able to see at least a small preview of the attachment before signing in. I'm thinking particularly of potential new members of the site who may not bother signing up because the site doesn't show any pictures at all. Also though, a photo in a forum might be critical to offering the help needed and if the new potential member or existing member can't see the photo then they will not sign in or sign up to answer the question or offer the help.
I do believe this to be a fairly big issue. The little paperclip icon on the post gives no clear indication of what type of attachment is actually available - I don't understand why the attachments are treated in such a private manner anyway. Also, people using image searches on search engines will never be directed to Amiga.org will they?
