In PowerPress version 1.0.2, the file powerpress-player.php line 106:
$content .= '<script language="JavaScript" src="'.powerpressplayer_get_root_url().'audio-player.js"></script>'.PHP_EOL;
Unfortunately, the audio-player.js file doesn't exist, so this throws an error. I've commented out the line with no apparent problems, but wanted to let you know about the bug.