NAV 12.3: Auto protect off on OS X 10.8.1

Hello,

 

I use a MacBook Pro with MacOS X 10.8.1 and NAV 12.3 (71).

Auto protect is sometimes off.

It's the same problem like here: http://community.norton.com/t5/Norton-for-Mac/Virus-Protection-off-Auto-Protect-could-not-load-scan-engine/m-p/784802/highlight/false#M6118

When I switch on I become the message "AntiVirus Auto-Protect could not load the scan engine. Please run LiveUpdate to get the latest version" too.

I try the hint with terminal and delete symantec.keychain. This works until I restart the MacBook.

Then I have the problem again.

 

Greetings,

Paul