3D FlipBook - Problems with using the plugin with Divi

I am evaluating the plugin for use with my website, to display the flipbooks in a popup window. This uses the Popups for Divi plugin and is triggered from a button using an anchor link.

The problem is that the book does not initially display: if I advance the pages, they appear; the same happens when any of the controls (e.g. fullscreen) are activated.

Something seems to be preventing the book from loading initially. I wonder if you have any suggestions.

Cheers,

Jon