As announced, we were expecting adCenter maintenance soon, and it did occur as announced on Saturday, 2/18/06, starting at 3am (PST) for about 24 hours. However, even though the ads should have not been affected, Jenstar posted a thread No ads being shown during AdCenter maintenance.
She reports that no ads were being displayed for a specific time frame, even though the ads should not have been affected. Jenstar is not the only one who reported this. At WebmasterWorld tbird reported;
I don't see adcenter ads, and my ads have sure not been served as I haven't received a single click in over 10 hours.
No word from MSN yet on this.
Forum discussion at Search Engine Watch Forums.