ICal (4.0.4 (1395.7)) on Mountain Lion 10.6.8 on MacBook Pro 13" not synching correctly to iPhone 3GS

iCal has stopped synching calendars correctly with my iPhone 3GS. I am syncing via iTunes, not via the cloud; I have the latest patches for Mountain Lion; I cannot upgrade the machine's OS, because I need Rosetta. The iPhone is running the latest version of iOS Apple has pushed, but this began a couple of patches ago - I was holding off on the latest because of Reasons, and upgraded hoping the upgrade would fix it. It didn't. I also have the latest version of iTunes for Mountain Lion.
Symptoms:
No appointments made on the phone, in any calendar, make it into iCal. (I have five calendars that used to sync; all stopped at once.)
Old appointments made in iCal before this started happening still sync correctly from iCal to the phone.
New appointments made in iCal sometimes make it onto the phone, and sometimes do not. I haven't been able to detect a pattern.
When new appointments made iCal do make it onto the phone, they are correct, except that there is always a second ghost appointment also created, only on the phone, called "New Entry." It will have the same time and date information as the actual appointment, and be listed as the correct calendar, but will contain none of the associated appointment data.
I have tried:
Upgrading phone to latest iOS version
Desyncing all calendars from phone, then resynching them.
Telling iTunes to overwrite all calendar data on sync. (I know this actually happened, because appointments I'd made on the phone which had not synched disappeared after overwrite was initiated.)
Resetting phone to factory and reapplying everything from scratch. (This was the most recent action, two weeks ago, was a huge pain.)
None of these resulted in any change in observed behaviour.
What is new in the last few days is that until now, all iCal appointments had been making it to the phone, so as long as I made the appointments in iCal first, I could at least know of them while in the field. Alas, that is no longer the case.
Any ideas?

Sorry, it says "New Event," not "New Entry." My bad.

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    Have tried everything possible, repairing permissions etc to no avail.
    You haven't tried everything possible or you would have a solution.  If you tried the most extreme possible solution (erasing the hard drive, then reinstalling the system and nothing else) and still had the same problems, you would have discovered that you almost certainly have a hardware problem.  For some solutions that you haven't tried yet, I'll refer you to the same two links I referred sylee48 to.
    As for that article, that's an extremely unprofessional piece of writing.  They publish - as if they were fact - the conclusions of untrained, non-technical users who do not have the necessary expertise to make such conclusions.  And they concluded that these were bugs that Apple should be working on.
    In fact, this may be one of the smoothest upgrades I've seen in a while.  (Boy-oh-boy, you should have seen the screaming here for the Snow Leopard and Lion upgrades!  It's positively peaceful in this forum compared to that.)

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