Are you sure you're running latest version of pre-release binaries and the skin? (1st and 2nd issues, more info: https://www.directadmin.com/evolution.php) Encoding problem might be related to non-UTF8 internal translation files.
I use Da 1.55 standard binaries.
Skin version: version = 07930d3b419ff84e15ff64ca13fecc4a9dae9d83
Sorry, maybe I'm clumsy because it's not a problem for others.
I checked out https://demo.directadmin.com:2222/ and I see the problem.
My problem is to click "Show All Users" at admin level then click "demo_user" and click "LOGIN AS DEMO_USER" and nothing happens, returns to admin main page.
This is the case with me.
Character encoding sorry, I was not attentive.
Are you trying demo_admin on your own server as well? This feature hasn't been added to the demo, so it does not work on https://www.directadmin.com:2222 as well (with enhanced skin). I'll talk to John on this, he might want to add it for demo_admin / demo_reseller Thank you!