you for reaching out to the Community regarding your issue, although I am sorry
to hear that you are experiencing issues with your vault password. This only started on the most recent patch correct? A Mondo patch could be used to see if we might be able to correct the issue you're having. We can take a look I'll leave the steps down below on how to do so.
Update and Mondo Patch: Subscription Release of Quicken for Windows
you get a chance to try these steps, please let us know what you find. From there we'll better understand our next option.