Switching between media is not always successful. Sometime it played both audio/video and other times it played only audio. When only audio is played, it rendered only black screen(maybe 1st frame?) or nothing(only background on the bottom of the MediaView).

Please try this:
http://fxsqe.sfbay.sun.com/fx1.0.1/CutePlayer2/FullScreenEnabled/CutePlayer2.jnlp

- Open the right tab by moving the mouse to the far end of the window frame.
- 2 FXM trailers are preloaded into the Media Library list.
- Type in "http://fxsqe.sfbay.sun.com/resources/media/mixed/LewisClark_HiDef.wmv" (>200mb) into the Single Media URI textfield.
- And this one too: "http://fxsqe.sfbay.sun.com/resources/media/mixed/alan_wake.wmv" (>100mb)
- Now you have 4 media in the Media Library list.
- Try to play and switch by double clicking a movie entry in the list.

With 1.0.1 b93, I noticed it wasn't always successful as I mentioned above.