This is a bit complicated to explain, so bear with me ... Essentially my problems seem to be with the way that iPads (and presumable all IOS devices) deal with modals. I started by implementing the @tpr's FrontEndEditLightbox module in order to provide a controlled method for editing pages while in the front end. This all worked beautifully in development and when testing it on my Windows PC. However, on an iPad, it ran into a problem: the modal would not scroll - only the background scroll