This is really weird and I'm not sure what to do about it. I installed the Furniture Catalogue add-on, which worked just fine and then stopped. I thought perhaps I had lost my key-bindings, but when I went to Controls to check, it was just not there. But it is in Add-ons, and checked.

This morning I went and sold up stuff, as I noticed I had some ornate things. These usually get put into junk by Zotan's Junk Handler, so I went to settings to check my configuration. Zotan's Junk Handler just wasn't there. But it is in add-ons, and checked.