Maybe you don't have Scrubby Zoom checked in the Zoom Tool options or you need to install the OSXCompatibility plug-in for photoshop cc 2015
Photoshop and El Capitan | Mac OS 10.11
Maybe you don't have Scrubby Zoom checked in the Zoom Tool options or you need to install the OSXCompatibility plug-in for photoshop cc 2015
Photoshop and El Capitan | Mac OS 10.11