Was the white wire originally on the old switch and was it in a three way switch setup?
If so it may not be neutral. It maybe part of a switch loop.
That appears to in fact be the case, thanks. I should have better described the situation.
It's a two-switch wall outlet, with one switch used for an outside light and the other used for a switched outlet, where I put a light module.
When I finished connecting the WS467, it worked, but the light came up very slowly and the switch buzzed slightly, so I knew it was wrong and immediately disconnected it.
So, I've got it connected wrong, and rather than trying to describe it, maybe someone could give me an idea how it should correctly be set up? There are two black wires and a red.
When I disconnected the two old switches, one of the black wires was connected to one of the leads of each switch, and the red was connected to just one switch, the inside receptacle, I believe.
Thanks,
Alex