Norton Anti-Virus for Mac 11.1.2 can't auto LiveUpdate

Dear Administrator,

 

I am running Norton Anti-Virus for Mac 11.1.2 on an Intel Core 2 Duo iMac with Mac OS X 10.6.8.  Norton stopped auto update some time last December.  When I run LiveUpdate manually, everything is fine.  The product just doesn't start LiveUpdate at the scheduled time on its own.  I set the schedule for LiveUpdate to run daily and the item is checked in the scheduled list.  I don't know what is wrong.  

 

Thank you very much for your time and effort in this matter.  

 

Sincerely yours, 

Zigang Pan