Ever had one of those simulation runs where you think you’ve optimized all the parameters, only to watch the whole thing go down in flames? Last week, I spent three hours tweaking a guidance algorithm, only for the simulator to throw a tantrum right before I hit save. It’s like it knows when I’m just about to see the fruit of my labor.
Totally feel you! Those moments are the worst. Have you tried saving incremental versions along the way? It could save your sanity next time. 
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I can relate! After spending three hours tweaking algorithms, I always wish I’d saved earlier. Have you considered using automatic backups?
Sounds so frustrating! It’s like the universe is out to get you right when you’re about to enjoy your hard work. Maybe you could try setting automatic save points in your system? That way, you won’t lose everything after those intense three-hour sessions. @william2093, have you had any luck with that?