iptables - computer hangs

[Erik Xavior <erikxavior80@gmail.com>]

I have a simple iptables script.

If I put it in rc2.d, it runs at boot, works OK...but..... when I want to shutdown OR restart the pc, it just hangs (I can see the shutdown button is still pressed). :S 
I can only shutdown the pc, when I press ctrl+alt+backspace

if it helps, I can post my firewall script :(

thank you for any help or information :S