Proximity sensor not working

[Slack3r]

I've had my Imagio since it came out, and the sensor hasn't worked once. I'm not sure why it's happening, because it seems my case (leather one from verizon) has a cutout for it, and even without the case it doesn't work.

Does anyone know what I can check to see why it's not working? Normally I wouldn't really care, but since the imagio doesn't have a dedicated lock button I can't just shut off the screen when I take a call, and I've had countless accidental button presses.

The problem has persisted through several hard resets, and even a rom re-flash, so I'm at a loss for options here.