Realplayer does not download all Youtube videos suddenly

A Few days ago , Realplayer downloader was working fine and now for lot of videos I am getting message as No videos found on that web address (
) . Earlier it was always ok. Tried restarting downloader , reinstalling realplayer as suggested by some websites. But it did not work. However today I saw it working on some videos (
)
And I thought it started working. But not really. When I tried previous videos it would not download but some of these videos are still working. Any clues ...
 
Back