I have tried every possible video extension, especially the ones designated as 1.5 compliant, in my Dimensions implementation of a 1.5 site, I never get anything but the tags or nothing if the code is entered in HTML.
To diagnose, I've tried: Disabling the MooMenu, installing MediaBox (it's beyond my understanding of how to use JS in pages), and even using the rhuk_milkway template instead. No change.
Is there some switch somewhere that needs to get thrown?