On my new iPad, it's just slides with the numbers 1 to 5 on, and the buttons at the bottom do nothing. Will check on a desktop browser later though.. (Not saying this to moan, but because it's so tricky to get things right across devices nowadays, despite the standards.)
I think it runs out of memory on the iPad. I reused this presentation code for one I did and it works, so I don't think there is anything fundamental, although they could have broken something in an update. Remember it is all in one big page as far as the browser is concerned.
