Hi Mindset, sorry you did not get your file saved. Right now there isn't anything in place to guard against that, mostly because I just haven't heard about someone running into that particular problem before now.

I've added a note on my todo list for MoI v4 to pop up an error message if the save was unsuccessful. In the meantime if you have an external drive that has a loose wire and gets easily disconnected or something like that, you may want to copy your files onto the computer's built in disk and work on your file from there and copy it back again at the end, rather than opening it directly from the external drive.

Sorry for the difficulty, - Michael