The End of Video Friday?

Has the YouTube search broken down? I used to be able search on 'chess' and sort on 'date added'. The results would go as far back as I wanted to look, which was usually two weeks. Now the function stops giving valid results on the fourth page. Here's an example:-

There should be many results returned between '4 days ago' & '6 days ago', and between '1 week ago' & '2 weeks ago'. I saw the same problem two weeks ago (with different videos of course) and hoped that it was just temporary.

Like many (most?) Google services, YouTube has no way to provide feedback. Looks like I'm out of luck.

***

Later: Google search to the rescue...

Results for chess site:youtube.com
http://video.google.com/videosearch?q=chess+site%3Ayoutube.com&hl=en

...It also has certain glitches, but they are less irritating than the YouTube problems.