Recently, some Google AdWords advertisers have been complaining in a WebmasterWorld thread that they were (1) being forced to upgrade to the MCC (My Client Center) section of the AdWords console and (2) after being upgraded, they lost their promotional credits in their accounts. That was reported late August.
On August 31st, in the afternoon, Google apparently emailed those affected by this with the promotional credit codes. One advertiser said, "I just got an email with the aforementioned credit codes." Some others also confirmed receiving such an email. The issue is, one advertiser said he tried the code and Google said they were not valid.
Google has yet to confirm or deny this possible bug.
Forum discussion at WebmasterWorld.
