Sorry for any overly negative tone in this thread but this is just getting really frustrating. Since GM7 I've had to cross my fingers every time I edit a sprite, because inevitably the "crash bug" will eventually befall my projects. This issue has survived over GM8, and still continues today in GMS. I continually submit bug reports but I've never received any input so far. So I'm now hoping that a forum post will help with ideas, suggestions, and solutions... How does this bug surface? Open a sprite. Make changes, or none at all, and then hit the check mark button. When the sprite editor window closes, and shows the summary of the sprite it crashes, and then causes a complete freeze in the software (representing by the "fade to white" effect). In these cases the only resort is to open task manager and close GM, or use Window's "program not responding" to close it. I'm not sure what the exact cause is. All I know is that it eventually happens. I tried replicating this in a blank project of 10 sprites but I could find no specific reason why it happens, and the sprite it occurs on is also random.