^They looked so similar, I guess I just assumed they both used the same engine. Indeed, the only real difference I noticed was in the style of the GUI.
Regardless, the only relevant variable would be my desktop PC's graphics drivers. As I said already, it worked fine on that machine just a few months ago and the nvidia drivers are the only thing that changed in the interim. No clue which version it was running back then, but it's on 295.73 now (and asking to be updated again.)