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I got the same problem and it ran away.

I got a mac #1 that sync with mobile me and to ical. The problem came when I decided to sync with ical on the mac #2. Note that I didn't had any problem with mobile me with both mac #1-#2.

I reinitialized the sync with ical with my mac #1 and mac #2. I had to cmd-q and restart ical AND omni focus. I just retry to sync ical with only my mac #1 and the problem go away. Anyway, all the events appears on the mac #2 ical because the calendar sync with mobile.me ...

Wish that workaround will works for you too.

Serge Gagnon