Three Finger Gesture on New MacBook Pro doesn’t work consistently
Most users of the new MacBook Pro are complaining that the normal three-finger gesture used in some Mac apps are not working consistently on their trackpads, and sometimes, not at all.
Where the problem is intermittent, it may manifest only on some parts of the trackpad. Some owners, including people on MacRumors forums, have speculated that the issue is related to palm rejection technology.
Either way it's unclear if the issue is a hardware or software defect, and Apple hasn't officially acknowledged the situation. Both 13- and 15-inch systems are being impacted.
Three-finger drag is available with OS X Yosemite or later, and can be used to reposition windows without moving the mouse cursor and clicking. It can be toggled through OS X/macOS's trackpad settings, located under the Accessibility section of System Preferences.