I,ve only got the real player or windows , perhaps thats why ?
Possibly, realplayer can play flash video, but needs the plug in from Adobe. However which plug in your browser is using to view flash files is anyones guess.
I find that Windows, Realplayer, Adobe and Quicktime generally make a hash of any kind of video playback, uninstall the lot and use Chrome instead, it'll prompt you to install a plug in if it finds something it cannot run.