More: I've determined the problem is that the eisy is receiving no event when I press a button on this particular keypad. More specifically, it receives events when the "main" on/off buttons are pressed, but not when one of the other four buttons is.
I recently upgraded to an eisy. Is it possible the programming for this keypad didn't get set up correctly? I've tried restoring the device. That succeeded. Also, the device is able to control other Insteon devices, but of course that doesn't depend on the eisy doing anything.
How can I fixe the device programming short of deleting and re-adding it?