Unable to view Interactive book (alpha)

Hi there,

I'm not sure I should post this question in this thread. Please do let me know if I should post it elsewhere.

I've tried four time to create an interactive book and although I can still edit them, at some stage I have stopped being able to view them or download embed code or content. See example here: https://h5p.org/node/500375

Any hints? Is it too early to be used?

I'm using a mac laptop and chrome

Thanks

eli