With the afflicted computer being a Mac, I suggest editing the settings.cfg file in the StarMade install directory, and confirming that the entries for "PLAY_INTRO" and "TUTORIAL_PLAY_INTRO" are set to "false". Some Mac models have had problems with in-game video, and the first symptom is this that the game either gets stuck at loading 49-50% when the intro video is supposed to play, or crashes at that point.
This bug was reported as resolved way back down the line, but I'd try the above anyway, just in case it's related to the problem.