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Weird issue with second display

TwitchyPuppy

Moderator
Jun 3, 2015
5,851
0
36
My second display shows me this:

Screen Shot 2018-06-16 at 9.10.58 a.m..png

It’s like a “ghost” app or something. I suspect something running without my knowledge.. If I open a window on my second screen, it goes on top of that line (so it’s not a monitor issue). If I change resolution or display rotation from settings, the line stretches or rotates accordingly.

I’m not familiar enough with Apple’s processes, in Activity Manager, to know what’s supposed to be running and what’s malicious, if anything.

When I close my MBP lid, so it displays everything just on my second monitor, the line isn’t there.

It was there on High Sierra and still there on Mojave, so I ruled out OS issue.
 

Just_Me_D

Ambassador Team Leader, Senior Moderator
Moderator
Jan 8, 2012
58,198
236
63
I assume the display settings are set accordingly. Is the resolution set to "scaled"?