Hey Fraser,
I'm actually experiencing the same thing and have been since the update to 4.0.219
llike the other guy, I've tried all of the options. It actually will block things like ps chat, I know because I've tried witch my mates before eventually allowing and that works.
It's just games (application's) like cod. The initial boot into the game will show the allowed and blocked. But eventually once searching for a match will at times throw me into a server outside of the circle/hex clearly restricted. Geo latency set to 0 strict mode on, fast search off.
No I'm not in a DMZ, I just have ports 3074 forwarded. And I make sure the vpn isn't up at the time of doing all this.
I tried all your methods, same outcome.
could I get access to the software and see if it helps?