My calendar was working well except for an error when tapping a day from the month view, it would FC. It took going to settings and switching day view to event and then back to time view for the FC error to go away.
At this point, as primitive as it may sound, I would suggest switching settings around and then back to what you really want and see what happens.
FB sometimes takes a while to update. I remember that happened to me back on 1.5. Then overnight or something like that, pics and all updated.
My only suggestion is to do little changes at a time and be patient... I have a feeling calendar, people, etc, will sort itself out soon.