zoom and pan are not working on the mouse Orbiting around objects with the  MMB, or &#9095; Alt LMB is working, and zooming is working with &#8679; Shift+/-,

However panning using &#8679; Shift LMB or &#9095; Alt LMB, and &#8679; Shift MMB are not functioning anymore. Neither is zooming in/out with scroll wheel. I've reset to factory defaults and restarted Blender several times.

My system:


  macOS Sierra
  Version 10.12.4
  
  MacBook Pro (Retina, Mid 2012)
  Processor 2.3 GHz Intel Core i7
  Memory 16 GB 1600 MHz DDR3
  Startup Disk Macintosh HD
  Graphics
  
  
  NVIDIA GeForce GT 650M 1024 MB  
  Intel HD Grphics 4000 1536 MB
  
  
  Serial Number C02J71T5DKQ4


My storage and files are being accessed from an external drive.
after restarting Blender many times over 2 days, and loading factory settings, finally decided to try changing orbit turntable to trackball instead, everything worked normally again once I did that. Changed back to turntable and saved to test it, things still working normally. problem solved.(so far). i`ll update this if status changes again.