http://www.bidderssite.com/cgi-bin/auction/auction.cgi?category=automotive4&listtype=current works so look for some difference between that and http://www.bidderssite.com/cgi-bin/auction/auction.cgi. Since erotica.bidderssite.com has a different set of data, I would bet that there is some data on the main site causing errors. Check your logs and see what you find.