Have you tried the latest version?
I found this in fix notes for 12.1.4.1
SMC.exe terminates unexpectedly when applying LU policy
Fix ID: 3402598
Symptom: The process SMC.exe terminates unexpectedly when applying a LiveUpdate policy with a Group Update Provider. This issue only affects the Polish version of Symantec Endpoint Protection.
Solution: Resolved a malformed string in the policy processing logic.