iCal continually crashes on startup

Ever since switching to Lion, my iCal keeps crashing on start up. It crashes more often than naught, but there are rare days that it won't crash on startup.

Here's what's happening:

1. I launch iCal.

2. Immediately, the spinning rainbow ball appears.

3. After a few seconds, it crashes.

4. I then "Reopen" after sending the crash log.

5. "Restore" or "Don't restore" appears. I select "Don't restore".

6. iCal opens and stays open.

Right now, I have two iCloud accounts with calendars turned on. My iCloud account has four calendars and my wife's iCloud has one calendar. There are no local "On my Mac" calendars.

Here's what I've tried:

- I deleted all local calendar files to start clean. iCloud repopulates the calendars. Still crashes.

- I deleted all preferences and all calendar files. Still crashes.

- I ran "Calendar Cleaner" to fix any calendar issues. Found a few and fixed them. Still crashes.

I'm not sure what else I can try. Any thoughts or ideas?

Thanks,

Russ