Pinch to Zoom Not Working

Suddenly, and spontaneously, pinch to zoom is not working in any area of Motion. I thought maybe I accidentally did some keyboard thing that disabled it, but System Preferences shows it's still enabled, and pinch to zoom is working normally in all other applications. It's just not working in Motion for some reason. I've restarted Motion and that didn't fix it. Also rebooted and surprisingly that also didn't fix it. Anything else to try?