During the last few weeks there has been a lot of frustration vented in the direction of Yahoo! Search Marketing (formerly Overture).
Often in the past, when an Overture system upgrade took place it was followed by a period of reduced usability for advertisers. This was usually not too serious and sorted itself out in a few days. Unfortunately, Yahoo! SM's recent upgrade did not run quite so smoothly. Many advertisers were unable to manage their accounts for several days, and in the case of some advertisers, daily budgets were ignored and ads were run at full throttle.