I have a site with 6 domains that are managed by the Domain Access module. We are running the Ad module (http://drupal.org/project/ad) and everything is working fine. We then decided that SSO would be nice to have, so I got it all setup and everything worked nicely. However, the ads all disappeared.

So I disabled the module, commented out the $conf stuff in settings.php and the ads came back. Would be nice to have SSO working, so if anyone has any ideas, please let me know. Ads from Google Ad Manager work fine, its just the ad module that has an issue with SSO for some reason.