I love this software, but El Capitan doesn’t.

I have published one interactive ebook with iBooks Author, and the software was a dream to use until I installed El Capitan. Now I open the iba file I’m working with (the source file for an ebook), and it is a long time* before I can edit. I keep getting the spinning ball and have to force quit. I have tried:

(a) Removing iBooks Author and reinstalling.
(b) Reinstalling El Capitan.
(c) Holding the shift key down when opening iBooks Author (seems to work sometimes).

If you start a NEW book, you don’t have the problem. If you try to edit an old one, you get the spinning ball.

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*I can define a “long time.” It varies.

Fang1944 about iBooks Author