For the love of Dog, institute an autosave feature. I use this software for business. Multi-Million Dollar projects. Constantly. I'm sure I'm not alone when I say that when we get involved in projects, we get tunnel vision. Why? Because Inventor is incredible software and the design possibilities are endless.
However, you can't include an Autosave Feature?
As much as I love your software, I curse your name every time I'm building a project for a client and the software just decides to close. No rhyme. No reason.
The VERY least you can do while your software is so prone to crashes, it to allow your customers who spend ridiculous amounts of money to use your un-reliable software is to ensure we won't lose our work as we use it.
Make it happen! Vectorworks has that feature AND NEVER crashes.