OpenVPN Kill Switch Not Working?

When I first bought my GL-MT300N-V2 and used OVPN with it, there was a nice little Kill Switch button, but since I upgraded to 3.012 some time ago there is no Kill Switch button, and when my VPN fails it just defaults to my regular connection. I have read that the Kill Switch is always on with 3.x, but I would say that is definitely not the case for me. How can I make the Kill Switch work?

You can try resetting button functionality or upgrading to 3.025

Just use iptables. Drop everything except 53 and 1194 and be sure to run OpenVPN on 1194.

Works perfectly every time.

iptables -I FORWARD 1 -p tcp --dport 1:52 -j DROP
iptables -I FORWARD 1 -p udp --dport 1:52 -j DROP
iptables -I FORWARD 1 -p tcp --dport 54:1193 -j DROP
iptables -I FORWARD 1 -p udp --dport 54:1193 -j DROP
iptables -I FORWARD 1 -p tcp --dport 1195:521722 -j DROP
iptables -I FORWARD 1 -p udp --dport 1195:521722 -j DROP