Yes, it crashes if you don't load anything. The load button doesn't actually save anything, but for whatever reason I needed to be able to write to the files after I loaded them so it opens a save dialogue.
There are many ways this thing behaves weirdly if you don't do things precisely the way you're supposed to, I'd recommend looking through the manual to see if you might be getting the saving procedure wrong.
There are many issues with this thing that I've figured out how to fix in the years since I made it, but like I've said in other comments, I've lost the source code to it.