Re: Sync Error all of a sudden...
I found out the address book records with picture not there (from Facebook appl) by this method.
In Tools-Desktop Options-Configure Sync Logging Options set Logging Method-Full (default is None).
Then do the sync, when error comes and sync finishes; under Help (? on top right hand side) select 'Support Resources'->'Organizer Sync Logs' (this html file is saved under
C:\Documents and Settings\<current user>\Local Settings\Application Data\Research In Motion\BlackBerry Desktop\XCPCSync.OEM\SyncSDK.209.601\Log).
Open the file in browser or html editor. Go to bottom. Go up a few lines and you will find the entry with the picture problem.
Go to blackberry handset address book, locate the address and delete the picture.
Again resync and repeat this process till you don't get any more sync error.