Why do "enhanced" .m4a file fail to playback in iTunes U.app?

I have a very similar problem in that my enhanced podcasts WILL play in iTunes U but they don't show any of the enhanced features (no artwork, chapters, etc.) In fact, they do the same in iTunes, but play perfectly in GarageBand and QuickTime. This is very irritating because you CAN listen to the podcast but you can't see the pictures that are being discussed making the whole thing pointless. I have seen other forums where it has been suggested that the podcast be saved as an .mov file and uploaded to YouTube but neither GarageBand nor Quicktime will allow me to save it in any sort of a video format. Someone else suggested opening it in iMovie and changing the format but iMove won't open an .m4a enhanced podcast file.

ANY suggestions from anybody would be appreciated.

Just purchased an iPhone 5c, so I am experiencing the same problem: How does one view the artwork track of an enhanced audio podcast?

I hate the idea that I have to use video .mov of my lectures. Yes, I can do it, but, no, it is hateful to burn so many electrons!

I use Profcast now, though I used to make my podcasts with GarageBand.