There was some server down-time yesterday during the afternoon and night (North America time). The ad servers were serving up mostly "default ads" and blanks. No impressions were registered because we were not showing actual ads.
The issue has been resolved on our end and the servers are operating normally. Thank you to those who reported the issue. It happened on a Sunday night (local time), so we're just now getting back to everyone who brought it up.
On a related issue, the Quality and Engagement scores all "went to zero" over the weekend. This has the same source as the problems on the ad server, so you'll see the numbers come back when the issue has been resolved.
Lastly, we've had a pair of reports that the "Default Ad Substitution" has stopped working as of late. We fixed some code last night that resolves some cases where the substitution was not happening. If this has happened to you, please let us know by e-mail or by a comment below.
For those who don't know about Default Ad Substitution, please check it out. It only takes a few minutes and it at least provides a hedge for regions where we don't have a deep rotation.
Monday, August 11, 2008