This issue with the YouTube filter not working still persists. I use this feature heavily, and this is impacting my ability to properly search for recent videos on some topics, in HD.
One way to get around this is to use the following search term: site:http://youtube.com (then other keywords) ...in a video search on Google and then select duration, time range, and quality. It's not perfect but it helps some.pic.twitter.com/zCpFIm06yE