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iCal is duplicating and not deleting: What should I do?

I performed the softward update for iCal and terrible things have happened.

Under all-day events, as soon as I open an event and attempt to add notes, the event (without the accompanying notes) is duplicated. But it will not allow me to delete the duplicated event, and when I tried to delete all future events (this is a daily occurence), it will not allow that, either. So now I have a very confused calendar indeed that is verging on the unusable.

What can I do?