which version are you talking about? which os are you using?
Wow, looks like I decided to leave out a lot of useful information. My bad...
Game Ver: UFO AI ver 2.2.1 x86
OS: Windows XP (all 3 systems) Not 100% sure on the service packs... I'll check tonight.
Update: Since we always dropped one player, we tried to add a 4th PC to the mix and it worked out. So when trying to connect 4 players at the same time we only got 3, which was our goal all along. Tonight I will troubleshoot the issue on our end with the PC that we suspect might be causing the problem (although that PC works fine with 1 vs 1 games) and then report back with anything else useful.