Mplayerosx

There's an issue where it won't open a video if the player window is closed completely. Try File-->New Player and then open the video for now.

Yup, happens for me as well, it appeared in Rev13-Test8, I guess it wasn't fixed before Rev13 was released.

Rev13-Test7 does not have this problem.
I'm not upgrading from Rev13-Test7 until this is fixed, since Mplayer OSX Extended keeps running even when the video is closed, unless it's manually shut down.

Same thing if you want to drag/drop a video to the dock icon or do "File, Open..." or "File, Open Recent", you need to use "File, New Player" or "Window, Show Main Player" before any of these actions are possible.

Just the simple act of double clicking on a video file from the finder, dragging a video file to the Mplayer OSX Extended icon on the dock or doing "File, Open..." or "File, Open Recent" should trigger a new player window to accommodate the new file being opened. And if one is already being used for playback, either play the new file in the existing player window or spawn a new one. And make it a preference for the user to choose which behavior is wanted.

Or if that's not possible, simply leave the last player window open at all times, as in, while Mplayer is running, never close the player window even when there is nothing playing.