Leonard0 - 8:02 pm on Mar 25, 2011 (gmt 0)
From the Analytics Blog
Update: 3/22/2011 5:15pm PST - A fix for this issue was released early this morning. It will take a few more hours for the fix reach all users. AdSense reports should be working normally after that. Unfortunately, we are not able to reprocess the data that was affected by this issue.