When the question of multiplayer use has been asked in the General Discussion forum in the past, some of the authors of BUG have answered that it was designed for single player use and although it may work for multi player, they don't guarantee it. They also said that, at that time, they did not intend to update it for multi player use. You might try asking in the BUG subforum in the Creation and Customization forum, if they have any advice. In essence, the problem you are seeing is not a Mac related problem, it is due to the structure of BUG Mod.