YouTube has made some changes and all their video feeds given by the link on the POHD YouTube rss feeds are now in 3GP video containers vs mpeg, flv etc ... Unfortunately the POHD does not recognized that video container and you get the unable to play media format message or the video is just being skipped because it cannot play it. If you look at the YouTube xml feed you will see that all media:contain url= something.3gp ; see example below:
<media:content url='rtsp://v2.cache6.c.youtube.com/CiQLENy73wIaGwln--SCoEDpphMYESARFEgGUghzdGFuZGFyZAw=/0/0/0/video.3gp' type='video/3gpp' medium='video' expression='full' duration='51' yt:format='6'/>
I believe a firmware change will be needed for the POHD to recognize the .3gp file extension; the codec used in that container are commonly used so POHD should be able to decode. See this link for more info on the 3GP video container: http://en.wikipedia.org/wiki/3GP_and_3G2
Anyhow still investigating this issue with YouTube so I could be wrong here but I do not think that I am. It is possible that other format exist on a different xml youtube link I just don't know.