There are two things that I've noticed:
1.
Previously, just the nuBuilder DB was shown in phpMyAdmin. (The URL looked like this index.php?server=1&db=nubuilder4)
Now I see all Databases on the server. I'm not sure that's the way it should be.
2. First I open phpMyAdmin through the "Database" Button then close the browser tab, logout from nuBuilder and completely and close the browser.
When I open the browser again, phpMyAdmin can still be opened though the link
https://xxxx/nudb/.
But this is only the case in Chrome, not in Firefox (FF shows "please log into nubuilder")
The cookie seems to be persistent.