jkraus,
Before I would change the keypad I would do a factory reset on it, delete it from the ISY and add it back in. Then put the "A' button back into the scene and try it. You can also open the event viewer and set it to level 3. Tools > Diagnostics > Event Viewer When you push the "A" button you should see traffic in the viewer. If you do and the scene still doesn't work then please be kind enough to send a support request to support@universal-devices.com and we can login to your computer and take a look.