Lost credentials after Windows10 CU update

Dears, 

I'm running an installation of youtrack on my computer, that runs windows 10. So far everything is ok, but as soon as I've been forced to the windows 10 CU release, I've lost all the credentials to log in. To be honest, I cannot understand whether it's due to a lack of permission or, it has been deleted essentials part of your database. Have you got any similar problem so far?

This is what I got: