It's not macs that crash cifpo, it crashes when two people have two different vehicles with the same name. The original burnside had a different number of nodes than the latest one but they have the same .truck file name, causing the server to break. I've never seen macs actually break it.
Sorry I have no idea how to fix it, I think you would get better support on the rigs of rods forums, they seem to have more experienced mac users than we do.