Please reinstall the PTP on the system and check.
OR,
Please find below step Symantec Proactive Thereat Protection OFF
Proactive Threat Protection (or Truscan) is referred to as SymHeurProcessProtection within the client registry.
(Please take a back up of the registry before deleting)
Delete the key HKEY_LOCAL_MACHINE\SOFTWARE\Symantec\Symantec Endpoint Protection\AV\Storages\SymHeurProcessProtection
Upon Deleting the KEY it becomes Green and shows waiting for update (In case PTP is OFF)
Repair the SEP from add or remove program
This will update the PTP
https://www-secure.symantec.com/connect/forums/ptp-malfunctioning