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For the first issue, the Themes, it sounds like you did not install the Functional Content - extra Menus, Themes, Titles, etc. See this THREAD for some background and some info on how to install that extra material.
For the second problem, it sounds like you do not have the H.264 CODEC installed. What version of QT Player do you have on your computer?
Also, Canon is usually pretty good at providing any necessary CODEC's on the system. There is usually an included disc with the cameras, and I would guess that their version of H.264 is on there somewhere. It might install with a driver for the camera, with included organizer software/editing software, or totally separate from anything else. Because the H.264 is included with QT Player, they may have left this off for the 5D/7D, assuming that everyone will have it already. Besides Apple's, there is also one from Lead, and one from MainConcept. Many feel that both of those are better than Apple's.
you'll are a wealth of knowledge - thank you for sharing! This is a new build so I don't have OT installed! The media did play fine on the Windows media player though. Guess I'll need to download the free version of QT then? Not looking spend any more $ and the Lead version seems to require a purchase.
I would go with Apple's QT Player (free), and monitor things. Where most users found issues with Apple's H.264 was when Exporting to MP4 with that CODEC. Both Lead and MainConcept are for $, though both come highly recommended. For many, they solved some issues with Export.
Good luck, and happy editing,