Watch a video while it downloads in iTunes 10

Previously when downloading an iTunes U video I could double click it and the video would start playing while it is downloading. But now after updating to iTunes 10 it doesn't seem I can do that? Is it just me or have Apple gone backwards on this.

I'm not sure whether this was available for iTunes U items before, but it definitely isn't available now. As a compromise, you can stream an iTunes U item directly from its listing in the iTunes Store. And yes, you would still have to download it separately if you want to keep it.

As of iTunes 12, you cannot watch a movie while it is downloading. This is a pretty recent change, but has been proven and is 100% reproducible. You have to wait for the movie or TV show to finish downloading. (Trying to play before it finishes downloading shows a black screen, until download is finished -- then play begins as usual). This is a real shame and makes no sense, given that an Apple TV can actually play while streaming... but, guess that's different software. (Netflix for the win!)