Norton Family is not running. This could be caused by a problem with the program

Today our son blew by the daily time limit. Although the limit is being logged, his session on the computer was not ended. Example messages below.

 

I can't find anything on the computer (checked Windows System and Application logs) to explain this. Is there a Norton Family event log somewhere which will explain what is happening?

 

5/16/13 8:11 PM : Norton Family is not running. This could be caused by a problem with the program, or else a user might have shut down a Norton Family component. Please restart the computer. [KIDS-HP]
 
5/16/13 8:18 PM : Blocked - Daily time limit reached [KIDS-HP]