Check you Host Integrity policies and look for anything that could cause this failure. I would suggest you to actually replace your HI policy in place by an empty one and see if the problem is there. If not, reapply you HI policy, and disable one by one every rule to see which one is causing the problem.
You may also enable SMC/Host Integrity debug to have a look at what happens (http://www.symantec.com/docs/TECH102412).