I've managed to compile a simple version that has reduced cell sizes (1x1, rather than base 4x4), but I am running into an issue where the gravity, and the velocity of particles does not update. Adding elements like PHOT and NEUT, while possible during a pause, crashes the game. Is there a simple way to re-enable the physics, and stop these crashes?

Edit: This issue does not occur on 2x2, or 3x3 builds. Also, the window becomes progressively smaller with each increment down in cell size.