I've had my Droid X for a couple of weeks, and the calendar has been working fine, automatically keeping up with my online Google calendar. Then yesterday it just stopped working. I tried to add an event and got a message that I could not add any events until I synced a calendar. Then I noticed that there were no events in my calendar on the phone whatsoever.
I've tried the "sync now" option, tried turning the phone off and on again, and I've had the code sent from my Google calendar to my phone, but nothing happens.