A user on a MAC is running version 9.  Their mail works fine, but when we open their calendar, after about 5 seconds it locks up.  I can see the progress bar at the bottom start to do something, but it hangs.  They are on a 9 template too.  If I take their mail file all the way back to a 7 template, the calendar works.  We have rebuilt their client using only the ID file & address book.  I am not sure where to go from here.  Any help??