I've had some problems with the YouTube videos since the Froyo update. Some videos when I click on them in the app give me the following error:
Sorry, this video cannot be played.
This video is not available on mobile.
Sometimes trying again on the same video it will work. I have no way to know if they worked before the update or not but don't remember ever having a video not play and I don't think I ever got that message before. In the moblile version of YouTube, it shows the play screen for the video but pressing the play button doesn't work.
In the non-mobile web site, the same videos play just fine. I wonder if it has to do with the flash update? Maybe that "Flash lite" made it work better before.
Here is a link to a video that always gives me the errors mentioned above but works in the full web site on the phone.
YouTube - Windjammers kite team, 4 stacks of Dynakite, Dieppe08