Our Vibe setup is behaving strangely when creating new appointments in calendar.
When creating a new appointment, everything behaves normally until you add an attendee - at which point the Event start and end info fields disappear.
This also happens if you edit an existing appointment, the start and end fields disappear. If you save the entry it saves it with no dates.
In either case the appointment vanishes and can only be seen in the "creation date" view.