I read on another forum that the developer of Adsense Notifier is aware of the problem and should have an update out today or tomorrow.
edit* - found this on his site -
"UPDATE November 28, 2007: Looks like Google updated something today - luckily I’m going to have some free time tonight and tomorrow to work on it. I hope to have an update out tomorrow evening. Thank you all for your feedback and patience!"
From -
http://code.mincus.com/3/adsense-notifier/