iPad Player Download Issues

I have a course that folks are viewing on an iPad and I am noticing some playback issues which I have narrowed down to being a cache (or lack thereof) problem.

It seems some slides are not downloading fully on occasion and re-launching the course, backing out of the slide and going back in are not helping because the player seems to think the slide is already downloaded. The only fix seems to be deleting the content from the player and following the link again to launch it in the player a fresh time.

So here is the question:

When the learner, on their iPad, clicks the link to go to the course - is the entire course downloading as soon as it launches in the player or is the player only downloading one slide at a time? Only loading the next slide when they click the Next link?