I am brand new to JW Player for Joomla 1.5. The player shows up where it is supposed to be, and will play only audio with the play button is pressed. Also, no video, no volume control working, and no pause/play feature working.
Though SWF files also load in the player, it is discouraged to use them. The player cannot read the duration and dimensions of SWF files and cannot control its volume or playback.