I did some more research today and discovered some Apple docs that helped. I now have it fully resolved and up & functioning again. I did lose the changes I'd made in my iPhone's calendar, since mid-week, as it defaulted back to my iMac's iCal. But it's only a few days of changes, so better that I lost that and have it working again, than not be able to sync on a daily basis.
Here's what I found via iCal Help: "Sync Services: Advanced troubleshooting for contact and calendar syncing".
I followed those instructions, and once I'd reset sync history, all I had to do was resolve the outstanding 1140 conflicts. It started with 840, which I resolved easily & quickly by selecting the checkbox that applied the same resolution to similar conflicts. Then I had a few I had to handle indiviually. Then the remainder of the 1140 showed up and I treated them like the first 840.
Hope this resolution helps someone else, too. It took me awhile to find.
Well ... the problem started again today!
So I had 3 days when my calendar stopped syncing -- those were very bad days, as a result! Then it synced when I followed the above procedure.
Now that I'm back to work from the weekend, the problem is back!
What has caused this problem to to start? Is there a bug with the latest iOS? Or is it a bug with the latest iTunes? Maybe I should not have upgraded either until I'd heard about the fall-out!
Either way, I'm now in trouble -- if my calendars don't sync, it is a big problem for me!
I have a similar issue. I'm syncing an IPod Touch with a MacBook Pro (10.6.8) and out of the blue one day I get hundreds of conflicts. I followed the instructions on several Apple and community pages (resetting sync history, deleting files in the Cache folder, etc.) and while the sync works, since this happened my iPod has become filled to capacity (it was about 1/3 full before this happened). So now several functions are compromised and I'm betting what's filling it is a bunch of duplicate of junk calendar entries...
If you have any tips, please, let me know. Thanks,