A WebmasterWorld thread named View Bids Tool Errors, shows that Yahoo! Search Marketing's bid tool is chocking up errors. This tool tells advertisers how much to bid for a particular keyword and advertisers are very dependent on it to run and operate their online businesses.
Deal is this WebmasterWorld thread was posted January 12th! On January 25th, an update popped up for this thread where a user posted that a response from Yahoo!
We are aware of the problem - it's a server issue and have no idea when it will be fixed. We are working on it as it is a priority for us. They also mentioned that this is not the first time it occurs.
So I figured I do my part and call Yahoo! out on this.
Forum discussion at WebmasterWorld.