Sync Alert - Change more than 5%

Hi all,
I am currently syncing between a MacBook Pro, a PowerBook G4 and a Sony Ericsson cell phone. Quite often on the laptops, I receive the error that states, "more than 5% of your calendar/contacts will be changed... are you sure you want to sync?" In most cases, only 1 or 2 items are being changed, yet I have hundreds of contacts and many more calendar items. In other words, much less than 5% of my items are being changed.
This become more than a minor frustration when one of my laptops is stuck on this warning, which prevents my other laptop from syncing. I don't always have the other laptop with me, so at that point, iSync is dead in the water.
Is there a problem here, or a way to change this warning? What might be going on?
Thanks,
-Keith

One of your free-standing computers being 'stuck' with this notice in the foreground will not prevent the remainder of your synchronization pool from interacting, and has nothing at all to do with iSync. iSync is simply the client responsible for interchanging data between supported mobile handsets, smartphones and Palm organizers and the Address Book and iCal applications. Nothing more.
It may be that the truth database on board one of your laptops is corrupted or outdated, or has become non-responsive to synchronization requests from other clients through .Mac Sync or a similar conduit. To deal with this, you should determine which of the machines is more likely the problematic one, and reset the framework using iSync on that machine. To do so, launch iSync, open the Preferences… dialog, press the Reset Sync History… button and follow any instructions which appear.
Once completed, synchronize—which will initiate a first time, slow synchronization and merge all client data, then synchronize again upon completion of that process, about five minutes after the first task has been completed. That should provide sufficient time to trigger other events across .Mac Sync or similar conduits, though your chosen interval determines the likely actual period of time you must wait until synchronization returns to normal.
You can also adjust the threshold which triggers this message in iSync in the same Preferences… dialog. But, choose your warning level carefully, and only after you have performed the reset.

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