Do you by chance have “Location” configured in any of your things? I have experienced a graphical weirdness when I have more than one tab at the top of the control view, which happens when you configure more than one location. One weird thing it was doing was going back to a previous tab when I tried to scroll on a new tab! The controls that needed to be scrolled to were unusable. This was on mobile Chrome, can’t remember if it was happening on desktop.
I also saw issues on my 4K desktop monitor where it would not display at least part of the view when I had Chrome maximized.
I had a couple of items showing when I first installed openhab2, after making a lot of changes I now also see empty control panel. Switching to simple mode did not help.
I just got hit with this bug too. Everything was working fine even with locations but today it’s just blank. I tried in different browers and have restarted but no luck.
This thing was failing to respond and just hung the client so it never finished. This is a bug somewhere but my solution was just to remove this thing. I’m guessing because it wasn’t complete (didn’t have channels) is what caused this but I’m not sure. If you’re having this issue check the dev tools in the browser for a failing request to hint at what thing might be the problem.