Following recent changes in the way YouTube streams video, DSM-520 owners are reporting that they can no longer play YouTube videos.
Now there is a new YouTube TV-website for the DSM-520 which works with the latest YouTube video. A 16x9 test version is available at http://active-tv.blogspot.com/
The new YouTube TV-web channel for the DSM-520 is completely different from any previous ones. It is fast loading and there is support for video search, Playlists, Subscriptions, Categories and Favorites (all of unlimited size). There is also flexible access to Standard video feeds. As an added feature, it is now simple to view any public videos of your YouTube friends. The 'info' key can be used to toggle on-off auto-pay of next video.