Just today my own PC running Vista and SEP 11.0.4000.2295 (SEPM is later release, but auto upgrade not working, but that's another thread to start later), I started getting a bunch of event log errors this morning. There are 2 errors. First one is:

59 LiveUpdate NT AUTHORITY\SYSTEM 6/25/2009 9:54 PM
Message: 6004: Internal authentication failed for the C:\ProgramData\Symantec\LiveUpdate\Downloads\Updt252\COHCOL.grd file.
Run LiveUpdate again as the cause may have been a transmission error. If the error persists, contact your network administrator or LiveUpdate provider.

Second message is the classic sescLU error event 13:

13 SescLU N/A 6/25/2009 9:54 PM
Category: The operation completed successfully.
Message: LiveUpdate returned a non-critical error. Available content updates may have failed to install.

These 2 errors keeps repeating themselves every now and then in pairs. I checked my definitions and they look up to date. All indicators are "green" meaning it seems OK. But curious to what these errors are and if my system is truly protected.

I also have been receiving seemingly randomly this error:

42 Symantec AntiVirus N/A 6/24/2009 8:52 PM
Message:
Auto-Protect Error: Auto-Protect is disabled because registration of the virus databases failedApplication has encountered an error.
For more information, please go to: http://www.symantec.com/techsupp/servlet/ProductMessages?product=SAVCORP&version=11.0.4000.2263&language=english&module=1000&error=0074&build=symantec_ent

Not sure if it's related, but it doesn't sound good either. Any ideas greatly appreciated.