My problem was with the images.
But when you said it is all working, I had a closer investigation.
My error was that after pasting in a URL I was pressing OK on the dialogue box immediately afterwards.
That doesn't work. It is necessary to click in some other field first, and THEN hit OK. That works.
I am presuming that (legally speaking) neither you nor CK editor would have any objection to what I am doing?
Thank you.