What does crash mean - BSOD ?
Please post details of any Windows or calibre error message.
Have you checked the disk for errors - with SMART, chkdsk etc?
What led you to try doing a database restore, and recreate your library?
Don't you have a backup of that 140K book library - tsk, tsk?
If you're convinced its specific to 3.47.1 you could revert to 3.46,
Previous calibre releases
BR