Keep getting "Unknown Error (-4)" messages when syncing

Hi all,
Last night I did a completely fresh reinstall of Leopard on my MBP, and ever since then I have not been able to sync my iPhone applications, or install the new ATT carrier update. Each time I try either of those, or performing a Restore, I get a message stating an unknown error occured (-4). I'm logged into my iTunes acocunt on both the phone and laptop, and I tried resetting the phone from it's system settings already with no luck.
Anyone else seeing this issue?

Took it to the Apple store where it was restored successfully, but upon getting home I'm still having this issue trying to add my applications back to the phone. I have redownloaded them both on my laptop, and on the iPhone, and I still cannot sync them. Ditto on the ATT carrier update, that still will not work without this (-4) error.

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iOS: Restore errors 4005, 4013, and 4014 - Apple Support
You may see one of these messages if the device unexpectedly disconnects during the update or restore or iTunes couldn't tell the device to go to the restore state.
The iPhone [device name] could not be restored. An unknown error occurred (4005).
The iPhone [device name] could not be restored. An unknown error occurred (4013).
The iPhone [device name] could not be restored. An unknown error occurred (4014).
Try these steps to resolve the issue:
Install the latest version of iTunes.
Restart your computer.
Make sure your computer is up to date. If an update requires a restart, check for updates again after you restart.
Restore using another USB cable.
Learn more about updating OS X.
Learn more about updating Windows.
Restore your device on another computer.
If you continue to see error 4005, 4013, or 4014 when you restore your device,contact Apple for support.
Learn more about other update and restore errors.
Thank you for contributing to Apple Support Communities.
Cheers,
BobbyD

Keep getting "Unknown Error (-4)" messages when syncing

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