Widgets don't save - what am I doing wrong?

Old habits don’t go away very easy. I removed the closing tag (there are only these three files at the moment), but no… No difference I’m afraid.

Next step for me is to make a child theme from one of the pre-installed, I think. But not today, this have taken too much of my time the last couple of days, and I don’t wish to take anymore of your time either.

Since the pre-installed themes work prefectly, the problem can’t be in CP code anyway. Thank you so much for all your engagement!

I am just taking a look at this while I drink coffee between other tasks, so please don’t feel the need to apologize for taking up my time.

You don’t need this. If you register a sidebar, widgets should work automatically.

Try putting your sidebar id in all lowercases (or not mention the id), according to some doc the id needs to be all lowercase (haven’t tried it though)