Also when I tried the video in JWplayer website setup wizard http://www.longtailvideo.com/support/jw-player-setup-wizard?example=205 it told me that (embedding this video is disabled by its owner) despite that the video embedding is actually enabled in youtube.
See this is the video link http://www.youtube.com/watch?v=zwcgr7_-zu8

Some youtube videos won't play after youtube updated how they deal with videos that they want to make money off of. I found that a lot of these are official music videos from the labels which are some of the better quality ones. Though a lot of other videos are affected as well, mainly ones that interact with or use advertising. About a one-fourth of the ones I have tried so far. If the videos you are trying to view are of this type, then only the latest jw player will support being able to view them through the flash player. It has to do with being able to show the adds that youtube requires with this type of video. MC should really be updated to the latest version of JW player to add this support along with some other updated features. Though if your video isn't playable because of this, you can blame youtube from changing their api, forcing jw player to update to use the new api, which in turn will force mc to update to the latest player. :laugh:

For more info, please see:

http://www.longtailvideo.com/support/blog/2011/01/entries

And I guess on a side note,

Germi, could you please update to the latest version of the jw flash player on your next update? This will fix a lot of playback issues along with some duration issues.

Thanks for you detailed reply, I guess I have the first problem which is the monetize problem because when I embed the same video without using JWplayer I see advertising appear in the bottom of the video, also I have this problem in one youtube channel I believe it's because they become a youtube partner which means most of their videos are monetized as I notice that their channel now has auto play feature which is for partners only or paid channels.

It's very important for me that JWplayer can play these videos because my entire site is depend on youtube videos.

Cool. Yeah if/when Germi updates to the latest jw player in this component, this part will be fixed. Lot of angry people on the jw forums as well that I saw as google/youtube kind of pushed this out quickly without a lot of notification or warning.

it started to work fine for me science yesterday march th9 2011, i didn't do anything, but now the player can play all Youtube Videos that wasn't working.

:S then it looks like maybe it was a YouTube problem..??

sorry I've been out these days (and will still be out for some more days), I'm traveling and the internet connection here is really bad!