So when you have sync problems like these, try to remove the following folder(s)
/user/Library/Application Support/SyncServices/Local
The programs doing to sync will recreate the files after you delete them and it provides you with a fresh start.
Always wise to backup the files before you delete them in case you want to reverse the process.
If that doesn't work: Try setting the sync to only sync one item at a time. (turn each tab off except one) Try turning that one off and seeing if it works through all the other syncs ok.