Also happening to me. I am on Windows 10 Home 64 bit and Visionaire Studio 5.0.9. It crashes on save often. I have been finding missing parts in game but I thought I did something wrong or made a mistake.
Example: I find lines "If condition (empty) is true". Or, at some point, my Inventory stopped working and I couldn't find out why.
Yeah, that's the crash corrupting your save. I thought I did something wrong at first too, but then I replayed bits I succesfully played earlier, and suddenly they did not work at all.
I did find this in the crash dump file though, apparently Visionaire tries to access some location it has no access to?
Here's the dump image.