When I have Wurst running and have it fullscreen-ed, my screen freezes and I have to restart my laptop (yes I have a Mac, lil broke boy can't afford a high end gaming PC to run Minecraft at 60 FPS instead of 55 FPS) This is ONLY when I am fullscreen-ed. If I am not, it works. This doesn't happen for older versions either and even when I have ALL mods off, it works. Maybe some bug with Wurst.