I am seeing widespread reports of Google AdWords advertisers complaining that their AdWords Quality Score has dropped significantly across their accounts and ads.

There are two different threads (and soon to be many more) at the AdWords Help forums with complaints and posts on Twitter and I have several emails about this.

The quality score drop these advertisers are noticing are in the range of about 3 to 4 numbers, which is massive and incredibly scary for advertisers. The lower the quality the score the less likely your ads show and the more likely you have to pay more for the ads.

Here are some quotes from the threads:

One advertiser said he spoke to a representative at Google and they confirmed it was a bug, but we have yet to hear that from Google yet.

Did your quality score drop? If so, you are in good company.

Forum discussion at AdWords Help.

Update: A Google spokesperson told us this is a reporting bug and does not impact ad rank: