can't arpspoof network!

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http://www.backtrack-linux.org – hey guys, I just notice that i can't use arpspoof on my network anymore!!! It use to work before on Backtrack 5 32bit gnome. But now that I switch to Backtrack 5 RC1 64bit gnome it doesn't work. All of my wireless tools are working but Arpspoof. I am using a Atheros ar9285 driver and works right out of the box with Backtrack 5. Is they any reason anyone no of that I can no long use Arpspoof. I have tried ettercap, easy creds 3.6, quick.sh, and many other tools or scripts and it doesn't spoof devices on my network any longer. I really don't want to down grade back to Backtrack 5 32bit gnome jus (HowTos)