gmb21 - 4:51 pm on Jan 25, 2012 (gmt 0)

steve8383 -- Have you checked the positions of your affiliate offers? It may be the affiliate ads on the site, rather than the 728x90s at the top of your forum pages, that are causing the issue. I'd be surprised if it's the leaderboards since they are used by thousands of top sites (e.g. news sites).