I am just a visitor of the EEA website, brought here by a link in TEEB's website (The Economics of Ecosystems and Biodiversity). I was browsing the atlas and checking the various highlights in different parts of the globe. When I tried to run a video in full screen, it just expanded the dark frame around it but not the video itself. I'm not competent enough to come up with a solution, but this can probably be fixed !
Maybe is it relevant to write that I use Firefox as browser on a Mac and installed the Silverlight plugin for Firefox only today. ;-)
Hoping this will be useful to someone,