Problem loading Ante-Nicene Fathers vol 1

I don't know if anyone else has come across this problem.  I am attempting to read some of the Early Church Fathers, and have a Reading Plan set up to work through the Ante-Nicene Fathers.  All went well until I got into the section of the letters of Ignatius that has two parallel translations side-by side. Whenever I try to use my iPad to load the book from the RP, I get the spinning pizza endlessly.  I have tried all the usual tricks (removing and downloading the resource, killing the app, removing and reinstalling the app, etc) and none of them seems to make the slightest difference. 

This all works fine on my Windows 7 PC, but not on my iPad 2 or iPhone 4S.

Any thoughts?

Thanks very much.