I figured out why my buttons “stopped” working. In CC, I viewed my swf project as I always did in CS6, clicking the tiny arrow in the corner of ‘Animation’ window. This way, in CC, I continually viewed my project as epub not as swf. It took me a while to realize that in CC my swf file needed to be viewed differently: Window>Interactive>Swf Preview. Small stuff, big difference. Problem solved!