If there is an ad that redirects and opens tabs you may want to send a message to the admin. They are not likely to see this thread but would read their pm's sooner. I know in the past they have gotten rid of ads that are more malicious or aggressive. They just need to know about it, specifically, so they can address whoever it is that does the ads for them.
They don't see the ads nor do others so they won't know off hand it's going on or what is causing it unless told in a fashion they will see it. Good luck, that has to suck.