I currently have servers where we can not kill hung processes as we could prior to VSE 8.8 P1. The process we are trying to kill had mfeavfk.sys running as a subordinate thread
I was under the Understaning that there was a "New" AP Rule that had to do with "Hooks", and that this was not here prior. I am not sure if it can be disabled - I do not recall the Name as i Have chose to not apply Patch1.
Not sure if that would help your issue but if I Remember the Name of the AP I will let you know.