Can you go here http://compuveil.com and tell me if on the right hand side in the widget "partners and Sponsors" if you see any images/logos? I am having some troubles with this as seeing them as guest. As far as I can see the permissions are fine. Just want to make sure it's just not a problem on my end.
No images or logos as your widget is using attachments for such. Is this not a permission to allow guests to view attachments just not ticked somewhere?