All things are gone, control empty, but items still there

Openhab was working fine, then I made some minor change in the Yamaha bindings/thing (the binding was already installed). Thereafter (although I am not 100% sure that they are related) the thing page in paper shows “No things configured yet.” and is completely empty. The control page in paper is also completely empty, but items are still there in paper, and the inbox is still working.

I updated to the latest openhab build and uninstalled the Yamaha binding. The only result of this was that all sensor values etc. is empty in the Basic UI site map.

Is there any way for me to get back my things?