Spectex

I have this exact same problem, whenever I try to join a server it freezes at a screen with "wait for host" in the middle, and there's a constant loud clicking or buzzing noise coming through my speakers. 'Esc' doesn't work, nor do any other keys, and arma refuses to be killed by the task manager (both trying to kill by application and the 'arma.lock' process), and Windows can't seem to kill it either if I tell it to shut down or restart. I have to power cycle to kill the program. This definitely isn't a router or firewall thing, I've had my computer set up as the DMZ from the beginning.

I just recently re-started playing OFP:Resistance multiplayer, and I've noticed an extremely annoying occurance. If I'm in a vehicle and it is hit by an AT weapon and destroyed (and I am killed), I seem to enter some sort of weird state. I can look around and see other players' chat, but I don't respawn (I've waited up to 5 minutes), and I seem to be removed from whatever team I was on. Instead of it saying e.g. "West (Name)" it just says "Name" before my chat lines, and I can only chat on global (no team/group/vehicle/etc.). I have only noticed this when I'm in armored vehicles (not jeeps, etc.) and the vehicle is hit and completely destroyed by an AT weapon, not when I'm simply shot while inside the vehicle.