I have a very minor bug where I have sometimes needed to refresh my browser before loading a game for edit. Bitsy ignores the game load otherwise. This has only happened a very few times. To comment on others, I agree that there might be a better indication of when in play versus edit. I remind my students that when the grid is off, they are in play mode. One thing that occurred to me when I taught Bitsy online last week was that there could be a way to minimize Bitsy tool panels, as opposed to closing them altogether, to temporarily save room when working on a game.