If you have limited users' capabilities on a computer, only users with administrator accounts can sync using iSync.
Symptom
Only users with administrator accounts can sync using iSync 1.5 or earlier. Other users can open the application, but it does not sync.
Solution
1. Log in as a user with an administrator account.
2. Choose Apple menu > System Preferences.
3. Choose View > Accounts.
4. Select the affected user name and click Capabilities.
5. Drag the file /System/Library/CoreServices/SyncServer into the list of allowed applications, or click the checkbox to deselect the "Use only these applications" option.
If you choose to keep a list of allowed applications, you should also drag these files into that list if the users may use mobile phones:
- /System/Library/CoreServices/BluetoothUIServer
- /System/Library/CoreServices/OBEXAgent