I know of several ISPs that work with Websense to filter sites that have amateur posts of pics or vids that are seen as crossing the line. After bouncing around the rest of the site and finding your pic and vid section I think I figured out why you might have their attention.
Previously suggested that you set up a link site but now I believe that your pic and vid posting section is getting you on some ISP block lists, thus reducing your traffic. If you do set up a link, I suggest you link to your picture/video posting section and host it under a different site name.
This issue could block thousands of other folks from enjoying your forum.
I'll get to it regardless, but my first reaction was that your site was down. (RCN is my ISP)
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