It's just out and has these tech notes on improved syncing...

..Mac

Improves automatic iDisk syncing for customers whose .Mac username
contains a period (.).
Improves overall .Mac Sync performance.
Addresses an issue with automatic and periodic syncing as set in
the .Mac System Preferences panel.
Reduces .Mac Sync timeouts when syncing large data sets.
Prevents large amounts of Address Book data from being changed
without authorization.
Addresses an issue which could result in properly unregistering a
computer.
Addresses issues related to syncing a large number of changes to .Mac
Prevents third-party syncing applications from presenting an
extraneous initial sync alert.

found at: http://docs.info.apple.com/article.html?artnum=304821

For those having insurmountable issues it might be worth a go.

Pat



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