I'm having a similar problem here. I don't get the Unable to boot to automation error, but sometimes clients on a build will boot to linux automation, and sometimes not. A consistency seems to be a freshly imported computer will NOT boot to automation, but once it has been build fully, it will. But again, that is intermittent.
Env details:
DS:
Windows Server 2008 R2 on an ESXi VM
SQL 2008 SP1
DS 6.9 SP4 w/ HIIS from Altrinsic Solutions
SEP 11 Update 5
When the environment was first build, everything was working perfectly. I then installed SEP (long story on why SEP install got delayed), and my problems began. Uninstalling SEP didn't help, and I haven't contacted Symantec yet for the proper "clean" tool. To add insult to injury, the server admin who installed SEP for me didn't take a VM snapshot before he did so, so there was no rolling back to prove it was SEP.
I also have an odd situation where if the PXE Manager service is stopped or stops, when it is restarted, the shared config vanishes (default name for it is "Linux Managed", but even if I change the name, it still vanishes).
Anyone else experiencing the same?
Regards,
CJ