Lately login and password requested - when starting the win-app (not the web app)

Lately login and password requested - when starting the win-app (not the web app)

Hello!
My windows app always started by simply clicking the icon.
And that is, what I'd like to have again. 
I had to delete and reinstall Nimbus on April 15. It is Version 1.0.19

What can I do, what can you do to return to the former behaviour?

Robert