ITunes 10.6.3 freezes whenever iPhone 4 or iPad 2 connected - SyncServer errors

Question

All was well toward the end of 6/2012. I migrated to iCloud and everything seemed to be working. I was away on vacation when MobileMe "closed."
Now I'm back and having terrible trouble synchronizing either of my iPhone 4s or my iPad 2. iTunes seems to be working well, purchasing apps & music and playing music, until I plug in one of these devices. At that point, iTunes becomes unresponsive for a prolonged period. The Console window repeated states:
7/11/12 12:10:53.961 PM com.apple.launchd.peruser.501: (com.apple.syncservices.SyncServer) Throttling respawn: Will start in 9 seconds
7/11/12 12:11:02.997 PM com.apple.launchd.peruser.501: (com.apple.syncservices.SyncServer[1728]) Exited with code: 1
This goes on for up to an hour or so. Then iTunes gives an error message saying that syncing has been disabled for this device, do I want to enable it? Specifically, it says, "iTunes cannot sync information with the iPad “Scott's iPad” because syncing has been disabled on this computer. Do you want to enable syncing? If you do not enable syncing, iTunes will not be able to sync contacts, calendars, bookmarks or mail accounts to your iPad." If I say "yes", the whole process starts over with unresponsive iTunes and Console errors, and I get nowhere. If I say "no", then iTunes is unresponsive again, and the Console SyncServer errors repeat for another 30 to 60 minutes, but then, magically, the device backs up and syncs. Attempting to sync again, with or without disconnecting the device first, means starting the whole frozen iTunes process over again.
My contacts, calendars, and email are being handled over iCloud on all devices. Now I'm noticing that the Mail, Contacts, and Calendars preference pane seems to be randomly filling in bizarre information for some secondary iCloud accounts, and it freezes when I try to turn on Contacts for one of those accounts (with more SyncServer errors on the console). I deleted the misbehaving account, and now the preference pane freezes when I try to add any account. I feel like there is a corrupted preference file related to SyncServer or Mail, Contacts, and Calendars. There used to be a way to manually reset SyncServer (or whatever it was called then). Does anyone know how to reset SyncServer or clear out the preferences and start over?
UPDATE: The Mail, Contacts, and Calendars pref pane finally crashed with the following Console error message:
7/11/12 1:19:49.972 PM System Preferences: Timed out waiting for the sync server
7/11/12 1:19:50.004 PM System Preferences: *** Terminating app due to uncaught exception 'ISyncServerUnavailableException', reason: 'Timed out waiting for the sync server'
I'm just trying to run a small business. This is way over my head, and I'd really appreciate any advice from someone more knowledgeable. Thanks.
--Scott

Answer 1

I fixed this by upgrading iphoto 9 to iphoto 11 at a cost of 15$ .It seems syncing photos
from iphoto 09 causes problems with the new itunes update.