Hello,

I'm getting started with 7.3, and have the auto save on. Stardraw crashed (PC, who knows why), and when I restarted it found 3 auto saved files and asked if I would like to use them. However, the files did not contain the drawings I made...
So I started over, and at some point needed to shut StarDraw down. I made sure to save the file, but when I re-opened the software and the file - no drawings...

I am sorry you have problems like mine, but it makes me feel a little better.  All of my saves were manual and my reopened file still reverted back to an incomplete previous version.  

Good luck.