i'm having problems on my blog too...the plugin is definitely in audio-player in the plugins folder where it should be, and i have the latest version of everythin: wp 2.5.1, Flash 9, the plugin 2.01beta, and java is enabled on my browser, but i get this error message in safari and ff where the flash player should be:
The clip is in an 'audio' folder on my server - which i verified in the audio-player settings.
I also tried to add audio via the dashboard when i was writing the post - the 'add audio' button. I uploaded the audio file for the post, and clicked the 'audio-player' button, then 'insert into post'. But that didn't work either - the error message was messier, running un-formatted across the page.
hope i to get it working,