When I navigate from left desktop window to right desktop window, a vertical line start appearing on the right hand side of the desktop. It only happens when navigating from left to right and if there is something small open rather than a maximised page/app/folder/file etc. See example below please. Restarting and this blog post didn't help. Any ideas?

Using MacOS Sierra 10.12.6

enter image description here

  • can you choose different background to see it better – Ruskes Dec 24 '18 at 23:43
  • It is still there with different backgrounds (inc solid colours). – BentCoder Dec 25 '18 at 11:39

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