Agreed. Firewalls at school prevent me from using apprentice very often. Also, you can't connect to an opponnet you're familliar with. I know tons of people via MWS username. I use it not for testing, but for when I'm bored or trying to learn how to play a new deck.
Well the firewalls are my own which I can open up what I want for who I want, but I just haven't been able to test it out beccause it crashes immediately. Now I know why.