As many beta testers know, the calendar in iOS 5b2 is pretty much unusable. I'm a calendar warrior and use it frequently; these are the three bugs I've discovered thus far. I have not seen them grouped together in one place yet, so I hope this helps other beta users.
- Calendar hangs indefinately in Month View.
- All calendar accounts must be turned off and on again to restore calendar functionality.
- "Availability" option is missing for new appointments.