Drag and drop does work.
And I'm overworked.
So I tried to grab the images by the frame, not by the center. The frame is for highlighting, the center for grabbing.
Funny, isn't it?
Drag and drop has never worked for me in Lightroom. The program doesn't (in my mind) allow you to intuitively organize shots. It's more difficult, certainly different, to organize shots compared to the Beta version.