Hello, we are having big problems with our iCal and .Mac account.

We are three people syncing our iCals with one .Mac account. Until recently it has worked pretty smoothly. Now though, we are all experiencing problems with error messages, duplicate and triplicate appointments. There are even appointments missing.

There are three error messages we are getting:

1)
Conflict Resolver
There are 57 sync conflicts involving Calendars

2)
The Application iCal
Mac OS X and other applications are not affected
Click Try Aagain to temporarily restore the applications default settings and open it again.
Click Report to see more details or send a report to Apple.

3)
The Application iCal
Mac OS X and other applications are not affected
Click Reopen to open the application again.
Click Report to see more details or send a report to Apple.

The third message appears when iCal crashes. For some reason it only stays up about 30 seconds and then crashes.

Has anyone seen these messages before and/or experienced the problems with crashes, duplicates/triplicates, or missing events before? If so, please help me fix it.

Thanks!