Instead of looking at the base url of http://www.musicsourcenow.com, it's looking at http://www.musicsourcenow.com/forums. I'm using vB 3.5.4. Ads do indeed show up on my site, but it still won't validate.
You probably would want to use Google's URL removal system to remove URLs from the Google index that don't exist any longer: http://services.google.com/urlconsole/controller
well, i did the removal of that directory via robots.txt, hopefully the ad network will work properly after the next crawl.