iCal date keeps resetting

This is a minor issue but after upgrading to 10.4.9 from Panther my iCal icon on my taskbar keeps resetting back to July 17th. With Panther it only reset when I turned the computer off. Now it resets when I exit the calendar, bring the computer back up from sleep, etc. Is there a way to stop this?

I think it's normal, iCal does the same on my Macbook...