iTunesU Course Manager scrolling problem

I am using the Italian version of iTunes Course Manager on Safari. The current version does not allow vertical scrolling (using mouse or arrows) of the left-side course page window. So I can see a certain number of course pages, but not scroll below to see more. I also tried on another (more recent) Mac computer. Same problem. I can see all my course pages on an iPad, but of course I cannot modify them there. Could it be a software error?