Whenever I change anything in my project, there's a small chance that the next time I save, it says that it's unable to save that thing that I just changed, for no apparent reason. This also makes it impossible to run my project any time this happens because it has to save first. Usually this can be fixed by closing game maker and opening it up again. But recently this hasn't worked with when I change a certain room in my project, and I just can't ignore it anymore. I think it'll let me save if I delete the room and remake it again. Why is this happening? Does this happen to anyone else? How can I stop it?