There has been a Google AdWords bug that has been an issue for just over a week now. The bug has been reported at WebmasterWorld and is described as a redirect issue.
When adding a new ad variation to one's campaign in certain browsers, AdWords automatically redirects the advertiser to the Campaign Management page instead of taking that advertiser to the Ad Group page.
The bug still persists today with no word from Google on a fix.
Forum discussion at WebmasterWorld.