While I'm not getting the error message, there's definitely something wrong with my stats on cnyradio.com (haven't checked my other two sites yet).
It's considering today to be yesterday -- I know it's already 3/18/11 UTC, but it's still 3/17 here in the Eastern US. Never had a problem with Stats not "knowing" the correct timezone before.
Also noticing that the stats numbers are WAY below where they normally are for my site, and a post that's several months old is currently my top post for the "today" that hasn't even started yet. This is very unusual because my top posts are usually the newest posts.
I'm glad that I have Google Analytics as a redundant backup, but I prefer WordPress Stats since it's right there whenever I login to the admin area.