Linear/Evolve WD500Z-1 added, but can't control

I’ve successfully installed my Dimmer switch to my living room lights, but I can’t seem to get it to cooperate with SmartThings. It shows up in my “Things” and the status appears to be correct, but it will not actually operate the light when I hit on/off. The command appears to be sent, in the IDE events listing, but the light never changes.

Oddly enough, just turning it on/off from the physical switch is working fine.