Guest VM: Mac OS X 10.8.4
When using iTunes (latest version), any type of video playback does not render at all. To reproduce, go to the iTunes Store, select the Movies section, select any movie (e.g. in the new releases section), and then play the trailer. Sound comes through, but video does not.
NOTE: I've confirmed that this issue exists in Fusion 5 (5.0.3) as well. Any ideas on what it might be?