I checked and I am using PHP 5.3.1, WordPress 2.9.2 and the 4.7.7 Pro Player. I tested using a couple videos I uploaded locally to the site by:
[pro-player type=mp4]http://mysite.com/wp-content/uploads/2010/04/converted_video.mp4[/pro-player]
and I couldn't get that to work so I went to the Pro Player web site and he had a series of example videos to use so I tried a couple of those like:
[pro-player]http://vimeo.com/7532457[/pro-player]
And they all said "Video is not available". I set the Cache to 0, any other ideas you may have let me know and I'll try it.
On the plugin author's site there were a lot of users that were having the same issue but they did not go into detail as to what caused it or if they resolved it and how they did not post it so I am not sure if it is something to do with server configuration, compatibility or what yet. BTW, I am on an IIS server if that helps any.
Thanks,
James