Hi - I have an odd problem with my Magic Trackpad (paired with 27 2011 iMac running Sierra public beta). Multi-touch gestures such as four-finger Mission Control and three-finger drag don't work if my hand/fingers are over to the left side of the trackpad surface. If the left-most finger is roughly on the left-most 20% of the trackpad, it doesn't seem to register and the gesture doesn't work. So, for example, attempting the four-finger Mission Control gesture results instead in a three finger drag. One-finger moving of the cursor works normally across the entire trackpad. Has anyone experienced this or something similar? Any ideas whether it's hardware or software related? I can't be sure when it started, but it's been through at least a couple of Sierra PB releases, possibly more. Disconnecting and reconnecting the trackpad has no effect. Thanks.