Im trying to view an [enhanced podcast/large video file] on iTunesU. Why can I see all the slides when I double-click on some tracks?
Double-clicking on tracks in iTunesU opens a preview of that track. Usually this works ok for audio or short video files because your computer can grab enough of the file to start playing properly. But with enhanced podcasts (mp3 files that contain synchronized slides or pictures) or large video files, the entire file needs to be downloaded first. If you Subscibe or Get Track and wait for the file to download, it should play without any problems.