pfSense-1.2.3-FreeBSD 7_2 20090530-2140 + havp I am having an issues where have service start then it stop
Status > Services [havp - start button] or
Services > Antivirus >> HTTP proxy > Save
I had the same proble, mine no longer does this after i reinstalled.
You chould install cron, and setup a start service job that starts cron every 1 min. I do this with ntop.
I do not know the executable path for havp.