I've tried the same quickstart on an ESB 4.0 and it works.
But, if you look at the log file, you can see there's an exception before you deploy the quickstart.
Could you try to stop the server and then delete the directories:
Then try again...
That's 4.9 off course :-)
Removing the working directories did not help. I downloaded jbossesb-server-4.10 and the bpm_orchestration4 quickstart worked fine out of the box. I have not done any comparison to see what is different. I have not tried a new or different version of soa 5.1 to see if it is now working and fixed there or still broke.