MP 1,1-5,1 Did I get malware or this is normal?

[zterm]

I have a MacPro 5.1.
I have Mojave installed, but am still using HighSierra most of the time.

A few days ago I installed a new USB PCI card and swapped my old GTX 680 for a Radeon 580x.

After the PCI card swaps, the only software I recall hastily installing –after receiving a notification– is an update from Logitech that doesn't appear to have installed anything but asked for administrator privileges. I even removed NVIDIA / CUDA drivers.

Everything works correctly, but when I turn off the computer, I notice that in addition to taking much longer than usual, a kind of double S-shaped video artifact/animation appears on a black screen. Here's a youtube video in case someone has seen something similar.

Maybe it's just a video glitch at shutdown (its a flashed 580x) but the fact that only happens with HighSierra is a bit intriguing.
I wonder if some malware may have found its way to the logout items.

Any help will be greatly appreciated.

 

[Mr_Brightside_@]

I've had that on my 5,1

 

[zterm]

Do you remember any details on how it started, what is it and how you fixed it?

 

[JedNZ]

Isn’t it Apple’s spinning wheel, but just affected by a graphical skew? That’s what I put it down to when I’ve had it on occasions (not recently seen though).

 

[zterm]

To be honest, I'd never put it down to that! And it makes a lot of sense. However, I'd like to know what is the cause, as it does not happen when running Mojave.