Confused, I also got a call from them. I wrote an email asking why my traffic went from about 350 clicks per day to 2. I made all new campaigns and still under 5 clicks... I raised my bids to being ranked first. Still barely any clicks. I changed all the content, still no clicks. I even made a campaign and directed the clicks at top ranking pages in google on the subject that didn't rank in msn. No clicks.
So a rep from msn called out of the blue one day. First she asked if I had resolved my problem. I told her no. She said that I had to wait until the beginning of May because adcenter re-evaluates campaigns at the beginning of ever month now. She said the system had to evaluate how much traffic my pages would get before they fully turned them on, so I didn't go over my budget......
To be honest it made no sense, and sounded like a ton of bullshit. I will post a follow up sometime in may if my traffic increases.....