Strange Flashing Effect and SCreens Don't Upate in KDE

[Vorlon]

This is a very strange problem that I was hoping someone could help troubleshoot.

My KDE desktop "flashes" and often does not update. The problem occurs after about 10 minutes after rebooting, and only if I have multiple virtual desktops. (Switching from desktop to desktop seems to aggravate it.) By deleting all the config files in my home directory, I can solve the problem, but then have to re-setup my KDE sytem.

I'm using an nVideo graphics card with the nouveau driver in a monolithic kernel.

"Prepackaged" Linxu distros such as Mint work fine from a live CD, and I have swapped lots of hardware so I am confident that this is not a hardware problem.

The problem occurs in both AMD64 and testing (~AMD64) systems.


Here is a video to show the effect:
http://www.Bralla.com/downloads/Linux-DesktopFlashingProblem-2017-03-27.mp4

It appears to be very similar (if not identical) to this bug:
https://bugs.launchpad.net/ubuntu/+source/plasma-desktop/+bug/1450228


Other than not using virtual desktops, can anybody suggest any troubleshooting to isolate this?
_________________
Casey Bralla
Chief Nerd in Residence
The NerdWorld Organisation