I can't reproduce this. I loaded a 13 page PDF, created a button linked to button 2 of a registration, switched to button 1, pressed the smart button, and it switched the keyboard to button 2. No page turn occurred. So I'm not sure how to reproduce what you've described. Did you link that same registration and button to the song itself on the MIDI tab of the song editor? Did you set up any MIDI actions under Settings->MIDI Settings->MIDI Actions to turn the page?
Thanks,
Mike
Thanks,
Mike