I have had similar problems to those described in this thread, but they are intermittent.
I can’t be quite certain, but it almost seems as if, on alternate reboots, CPF does different things:
on one boot, it does not turn on Application Monitor, Component Monitor and Application Behaviour Analysis… with the result that Protection Strength is very poor (all red); also, usually there are popups that tell me Application Monitor and Component Monitor have failed to load (or something like that) and suggest that a re-install may help;
on the next boot (or at least one boot in three) everything seems to run perfectly… with Protection Strength showing as Excellent!
So far, since installing CPF, I have not had the laptop it is installed on on-line at all, while I have been getting rid of an infestation of ad/malware and viruses. Today, having installed SP2, I decided to go on-line to start installing post-SP2 critical patches… but CPF did not start properly, so I quickly took it off-line again. When I re-booted off-line, CPF came up OK.
It seems to me that a firewall that only comes up intermittently is not much use at all. At the same time, re-installing it seems like a drastic move when it comes up OK nearly every other time!