Hello, I have an early 2015 13" Retina MacBook Pro on 10.13.4 with a VERY weird issue. Every so often (like 3-4 times a day), the trackpad will "forget" the two-finger zoom. I'll be in Photoshop, Pages, or Preview and pinching or unpinching my fingers will not zoom in or zoom out. The only way to get it working again is to 1. Go into System Preferences>Trackpad 2. Uncheck the "Zoom in or out" option and 3. Check it again. Afterwards, two finger zoom will resume as normal. Until it happens again! I've tried resetting the PRAM and SMC, but the problem persists. Has anyone else experienced this? I've Googled this weird issue and can't find another occurrence of it and so I have no leads. Thanks for your help!