Gah! That's definitely annoying as to why it's causing an issue, for sure. My main desktop has four monitors, but I only use one with my mac. So that explains the difference. Something about dual monitors on osx really causes lots of trouble with a lot of software for some reason. Apparently if you switch to using HDMI as the setting instead of lightning that might help? That might be what you tried in the other thread, I'm not sure -- there were a variety of solutions in there.