HandlessCacti

I use a MacBook on MacOS Mojave. I can get onto Tiberian Sun multiplayer fine but when I press start it logs me out of my computer I then log in and can hear everything happening but everything is as if id just logged on and I can't find it when I press command option escape to see my apps. how can this be fixed so that I can play? recently I haven't even been able to get onto the game launcher as whenever I click it my computer freezes, resumes then freezes again but after this it still doesn't even open the launcher