You're running 14 RTM, which is one version behind. The latest version is 14 MP1:
http://www.symantec.com/docs/TECH154475
The fix notes for 14 MP1 don't seem to indicate this is any kind of bug:
http://www.symantec.com/docs/INFO4193
...but I suppose trying the MP1 client to see if that works would be a quick way to check. You can install the latest client version without needing to upgrade your SEPM to 14 MP1.
Additionally, you could follow the steps in this KB article:
http://www.symantec.com/docs/TECH203497
...to see if it helps narrow it down.