So tonight was the first time I've used the whiteboard setup with a projector on a wall. Up until now, I've just pointed the wiimote at my computer screen to fiddle around. But I hooked up a very simple setup with a projector in public and it nearly failed.

I had absolutely no problem hooking the wiimote to the computer, and I had no problem setting up the calibration. The wiimote was seeing the light from the pen, but it wasn't tracking when I moved the pen. It would only register the first location where the pen was turned on.

Here's my setup:
-Vishay TSAL 6400 pen that I bought from http://penteractive.us/
-WIDDCOM stack.
-XP fully updated
-Smoothboard
-The wiimote was at about a 45 degree angle to the left in relation to the screen, and about 7-8 feet (2-2.5 meters... I think... I'm a stupid American and don't think in the metric system) away.
-The screen projected was about 3 feet by 4 feet.

Anyway, it seems like it was a pretty good setup, nothing crazy. Why did it not track the motion?

Utilization was in the low 60% range, so not too bad there.
The smoothing was anywhere between 5 and 8.
I'm not sure about the IR sensitivity, in fact, I didn't even know you could adjust that.

I tried Johnny's Wiimote Whiteboard as well and had the exact same results.

EDIT: After messing around troubleshooting everything I could think of, it seems my batteries were low in the pen. I replaced them, and am getting better tracking just here on my screen. That may have been the issue. I feel silly now.

Indeed. Thanks!