Wix Multilingual problem

Nice function, you are going the right way… However…
I have a problem with the new function Wix Multilingual. When I put it on the page it shows ok, and also in the example-modus. But when somebody logs in on the website, there is nothing there. What is going wrong?? (The site is published)
Second question for this function. How do I use this with a database and using the setting of this button??