Hi,
I know the pics aren't showing for non-registered users. The attachment system, is an addon to the basic forum system. The forum itself is a free system which anyone can use, and so is the attachment addon. There isn't a setting I have found which enables non-logged in users to view the attachments. I realised this was a drawback when I put the system in. I'm looking into it. I would like the pics to be shown for guests also, for the same reasons.
If your fear of staying alive, outweighs the thrill of making the corner, brake.