I actually did that and it kept asked me for the master password to the original database I created. The same thing happened even after uninstall and reinstalling the beta 6 version. I was able to get the welcome screen only after searching an removing all the registry entries related to the product.
Is it possible or will it be possible to open each vault independently? If this is possible it would nice to open multiple copies of enpass. One for each vault as an example.
Please consider implementing this suggestion. I think it would be great if one could add a secondary means of securing a specific folder or entry within a vault.