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One of the adverts that appears on the site is directing me to another website and then popping up a prizewinner notification message. I'm not sure which ad is doing it, but I end up on a page displaying this:
Attachment 52586
It only ever happens on this forum, so it's not adware on my PC that's doing it.
According to the adsense program none of the ads should be throwing you to third party sites without user intervention(a click or similar) but weirder things have happened - can you find the specific offending ad so I can report and blacklist it? This would help as I can't see the site mentioned in your image anywhere when I search the control panel for it.
Unfortunately I don't know which ad it was as I wasn't viewing the forum at the time I got redirected; I'll try to keep an eye on the ads in case it happens again.