I tried a user with known attachments:
http://www.zeewaterforum.org/forums/...php?userid=379
Are "Unregistered" users permitted to view and download attachments from your forum? Do you have thumbnails enabled?
The script ran and the page loaded, just without any attachments showing. Must be some difference with 3.0.3's queries or variables or perhaps I don't have the permissions. I will look into it this evening and get back to you.
BTW, I keep live reef aquariums too. I like your forum, too bad I can't read it

I used to post at Albert Thiel's site quite often.