When you configure Windows Media Player to use full-screen visualizations:

- A white or black rectangle displays on your secondary monitor.

- A white or black rectangle is visible on the desktop of your primary monitor.

To workaround this behavior, either press the Maximize button in Windows Media Player, or:

1. Open Windows Media Player.

2. Press Options on the Tools menu.

3. Select the Visualizations tab.

4. Select the visualization you are using and press Properties.

5. Press the screen size that matches the resolution of your primary monitor.

NOTE: See Q268352 - WMP7: How to Run Visualizations in Full Screen Mode.