Norman PF is for me the best free firewall ever (tried them all).
Changing is no option.

I’m now using Avast 4.1.501 and thats no problem at all.

Avast versions higher then 4.1.501 are also locking and freezing up my computer (I’m not the only one with that problem) so I won’t install that anyway.

(and that’s no NPF problem ;D)

So if 4.1.501 is not save anymore, please tell me and I will go back to AVG.