[Plugin: ProPlayer] 500 Internal Server Error

First thank you! This plug in appears to be exactly what I need! I’ve successfully tested it on my backup “testing” site, but when I try and implement it on my live site, I get a scary “500 Internal Server Error” message on the post!

I’ve only tested 2 file types. One (.mov) that I’ve uploaded to my site that works just fine. But the other is a YouTube link and that one does not work. When I insert that one, the page crashes. Please help!

http://aftercredits.com/2012/05/video-test-ignore/

http://ww.wp.xz.cn/extend/plugins/proplayer/