Wacraft III lan connection problems?

long story short, 3 computers playing, 2 macs, 1 windows. the macs have the same version, but the windows has a version slightly different from the macs. it still works, but then another windows person decided to join in, and because we all have cracked versions, we let the fourth guy copy the files from the original windows player. the game is working on the fourth computer, and he has the same version as the first windows player, but whenever we try to play him (the fourth guy) we cant see his games and he cant see ours. we are all connected to the same local network and all that, im sure that it is just something in the game. whatever works gets BA.