Lee,
Thanks for the reply. The event viewer shows a lot of activity when the working button (scene C) is pressed but shows nothing for the other buttons. So I did as you suggested, selected the primary button and chose Restore Device. I saw a lot of activity in the event viewer as the device was restored, but unfortunately it didn't fix the problem. I tried twice and even closed the ISY admin console and restarted it, but the viewer still shows no activity for all buttons except button "Scene C". Any other suggestions?
Todd