Good news!
A friend has just talked me through doing Draganizer. It turns out I was doing the equivalent of trying to drive with the brakes on

I thought the show/hide triangles were the play icon(s), and was trying to use them, one after the other, to play! What a mess....
Thank you friend (Stevekins) for the talk through, and thank you Danny for a fantastic article at Atn.central.com, which I finally found about 3 days ago, and have read from start to finish. It was really useful. I may yet end up writing one myself. And thank you palms 1 for the moral support!
Most of all I just done my first pic with Draganizer. I totally love it. It was worth all the mistakes!