shared app performing differently on identic devices

Hi
I am having many problems with my ebook on the iPad's InteractPlayer. After many trials to share my ebook (81 pages, about 145 MB in weight) with myself, and not being able to (the downloading bar on the iPad freezed at about the last third; and the only way to exit that situation was to delete the player and reinstall it) I tried again dividing my ebook in smaller parts and I succesfully shared a version of the first 46 pages of my book; downloaded on the iPad and played it. But my client, to whom I had send the same shared part of my book; reported that he could download the book and open it; but was not able to pass the first page; as if the next page function was not working..
I don't understand why it works on some devices and not in others, being in this case both of them iPad2 with iOS7... but It would be a disaster if after publishing, a portion of the buyers won't be able to play the book... could I share my app with some of you to see if you can reproduce the problem?

thanks
Pablo