In my case, running Live Update results in the following entries in /var/log/system.log. I will send my crash log to Symantec if it is not too onerous to do so.
Jul 17 15:03:57 iMac.local Symantec Endpoint Protection[983]: IPS Enabled : 1
Jul 17 15:03:57 iMac LiveUpdate[1372]: objc[1372]: Class XByteCountFormatter is implemented in both /Library/PrivateFrameworks/SymAppKitAdditions.framework/Versions/B/SymAppKitAdditions and /Applications/Symantec Solutions/LiveUpdate.app/Contents/MacOS/LiveUpdate. One of the two will be used. Which one is undefined.
Jul 17 15:03:57 iMac LiveUpdate[1372]: objc[1372]: Class SymAboutBox is implemented in both /Library/PrivateFrameworks/SymAppKitAdditions.framework/Versions/B/SymAppKitAdditions and /Applications/Symantec Solutions/LiveUpdate.app/Contents/MacOS/LiveUpdate. One of the two will be used. Which one is undefined.
Jul 17 15:03:57 iMac LiveUpdate[1372]: objc[1372]: Class SymURLTextField is implemented in both /Library/PrivateFrameworks/SymAppKitAdditions.framework/Versions/B/SymAppKitAdditions and /Applications/Symantec Solutions/LiveUpdate.app/Contents/MacOS/LiveUpdate. One of the two will be used. Which one is undefined.
Jul 17 15:03:58 iMac.local SymDaemon[1371]: No persistent timers found.
Jul 17 15:03:58 iMac com.apple.launchd[1] (com.symantec.symdaemon[1371]): Job appears to have crashed: Illegal instruction: 4
Jul 17 15:03:58 iMac com.apple.launchd[1] (com.symantec.symdaemon): Throttling respawn: Will start in 9 seconds
Jul 17 15:03:58 iMac.local ReportCrash[1354]: Saved crash report for SymDaemon[1371] version 5.2.1 (1) to /Library/Logs/DiagnosticReports/SymDaemon_2015-07-17-150358_iMac-Home.crash
Jul 17 15:03:58 iMac.local ReportCrash[1354]: Removing excessive log: file:///Library/Logs/DiagnosticReports/SymDaemon_2015-07-17-150021_iMac-Home.crash
Jul 17 15:04:00 iMac com.apple.launchd[1] (com.symantec.liveupdate.daemon.ondemand[1374]): Job appears to have crashed: Illegal instruction: 4
Jul 17 15:04:00 iMac.local LiveUpdate[1372]: Connection Died
Jul 17 15:04:00 iMac.local Symantec Endpoint Protection[983]: Symantec Endpoint Protection could not verify the integrity of one of its components.
Jul 17 15:04:00 iMac.local ReportCrash[1354]: Saved crash report for LiveUpdateDaemon[1374] version 6.2.2 (1) to /Library/Logs/DiagnosticReports/LiveUpdateDaemon_2015-07-17-150400_iMac-Home.crash
Jul 17 15:04:07 iMac.local SymDaemon[1379]: No persistent timers found.
Jul 17 15:04:08 iMac.local ReportCrash[1380]: Metadata.framework [Error]: couldn't get the client port
Jul 17 15:04:08 iMac.local ReportCrash[1380]: DebugSymbols was unable to start a spotlight query: spotlight is not responding or disabled.
Jul 17 15:04:08 iMac com.apple.launchd[1] (com.symantec.symdaemon[1379]): Job appears to have crashed: Illegal instruction: 4