You must choose "Configuration #1" for "Device Enabled" be active
The problem many have was because bad device choose.
Use test button for choose device, and assign a Lightpen Horizontal, Lightpen Vertical and American Laser Games/Picmatic Left Trigged like Satanicainc write. and SAVE configuration.
If you can't choose correct device goto configuration folder and open marbela vice configuration with notepad.
Inside file you will see all your devices, compare them ID with devices on control panel. With thisi way you see devices with no mistakes.