CS6 Audition hitches on Sierra MacBook Pro

I just got a 2016 MacBook Pro running Sierra 10.12.3. CS6 Audition is giving me trouble in multitrack mode when I try to drag sounds around the timeline. I try to drag to certain positions and it just won't go. It's like snapping, but snapping is turned off (and it's not snapping to any logical place). I can usually make the edit I want by zooming in a whole lot, but it's time consuming and I make hundreds of these edits a day. Anybody had this kind of trouble?