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I too am having this problem (see quote below).

I've posted a support query and am waiting for a reply. Has anybody else had it and found a solution? I've followed the advice about using the Terminal and resetting iSync sync history (as listed in the sticky), but none of these fix the problem. I've already wasted a lot of time and my tasks are all over the place. Help!

DWS

Quote:
Originally Posted by boylejillson View Post
Yes, this is the error message:

Unable to synchronize with iCal:

Exception raised:
---------------------------
Name: ISyncSessionUnavailableException
Reason: Client com.omnigroup.OmniFocus is already participating in a sync
Info:
(null)
Backtrace:No numeric backtrace found