We've identified the root cause, taken a corrective action, and are continuing to monitor the publishing queue as it catches up. Change publishing should be returning to normal soon.
Posted Aug 15, 2017 - 12:30 EDT
Our publishing queue, which takes changes from the UI & API and pushes them to the ad servers, is currently backed up and taking longer than normal to process your changes. Most folks are seeing only a slight slowdown of a few minutes, but our heavy API users will see a considerably longer slowdown. We are investigating now.
Ad serving is NOT affected. All ad serving is working normally.