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It seems to be bad behavior by iCal when you have two events of zero duration at the same time. If they aren't zero duration, iCal makes some effort to spread them apart, though it seems to be more successful in the Day view than the Week view. Probably have a better chance of getting Omni to make the zero length events long enough to get iCal to spread them than getting Apple to fix iCal, but you should report it to them nonetheless: