Ok, so I finally made a server (YAY!), BUT, my gf is playing also and when she shoots me with smg1 and flamer1 I get no damage. (flamer1's "burning" still hurts me, but not the initial damage) All weapons besides those hurt me, and bots with those can also hurt me. If I can find out how, I'm going to attach a demo of us testing all weapons.
She's on the version in Lubuntu Software Center (1.4.5 I believe)
I'm on SVN -r6550 (so I can connect to older ones)
I don't know why this would happen, and I just thought I would bring it to your attention.
It might get fixed when I update her version tomorrow though.
Thanks for the help.