It appears that if you try entering a bid for less than $1 in Microsoft adCenter, the interface pushes that up to $1.00. Reports come from WebmasterWorld stating this.
Anyone seeing new keywords submitted not allowing the bid amount you want to be accepted? i.e. if you are trying to submit a new keyword with a bid for, say, $0.15, the UI keeps returning $1.00 or some other higher amount. Seeing this across many, but perhaps just 5% or so, of new keywords I am trying to submit.
Several other people confirmed this to be an issue.
The adCenter reps have confirmed the issue and stated that it is a high priority and they are hoping to fix is asap. The issue was first reported on the eve of October 9th. It is four days later now. So I guess Yahoo! isn't the only one with problems.
Forum discussion at WebmasterWorld.
