Running v3.20.01 on WinXP for ages, no problems. Moved it across to Win7.
On a couple of occasions, shutting down Win7 with Passwordsafe minimised, a couple of times a dialogue has appeared asking whether I want to save the database. I was only given a few seconds before a decision was forced on me. On rebooting, the database had disappeared. No sign of it in the recycle bin. I had to recover from a database which was a week or more old and I don't know what (if anything) I've lost.