are the clients reporting to the manager, do u see the green dot on them?
you are running a very old version. should be a defect which is now corrected.
Symantec Endpoint Protection Manager Scan log status is not updated
Fix ID: 2778391
Symptom: The scan status of the Scan log doesn't get updated when an administrator-defined scheduled scan is suspended and then completed.
Solution: Fixed by adding the suspended event into a list of known events that the management server will process.
http://www.symantec.com/business/support/index?page=content&id=TECH103087