bug on the gui enable/disable firewall doens't work 100%

i found a litter bug
windows xp sp2 with the last update , only software installted nod32 2.7 last built
i have a modem (without a firewall built it)
about the stealt mode , the mode installed by comodo!
this test
http://www.grc.com/intro.htm-->shiled up test -->file sharing test!

1)well if i disable the firewall , i did a test Shields UP!! — System Error ->file sharing , the test tells me “you are not safe

2)well if i enable the firewall , and i did a test again -->file sharing , the test tell me “you are not safe

3)well i found that i need a reboot to enable the firewall ,did the test “you are SAFE

i tried to re-enable the firewall via the icon in system tray and firewall–>advanced–>firewall behavior setting–>train with safe mode–>apply
nothing , i need a reboot

can somebody confirm ? test it
thanks have a nice day