[sutzig]

I did it both ways. If I launch ZMI and then click to select the books to export, the ZMI dialog box disappears/closes and when I reopen it the books are no longer selected. Catch 22.

I discovered however that if I launch ZMI, hold down the Command key (Mac OS), and THEN click on the books, I can select the items. If I just launch ZMI and click on the title, , ctrl+click on the title, shift-click on the title, option+click on the title, the ZMI dialog box disappears/closes.