You're not annoying at all, thanks for the clear details!
Since restarting the graphics driver didn't resolve it, let's perform a simple step to fix potential issues related to Windows Explorer or recent software conflicts.
Press Ctrl + Shift + Esc to open the Task Manager. Once it's open, click on File > Run new task, type explorer.exe, then press Enter.
This step will restart your desktop and taskbar, possibly fixing the flashing problem.
If this doesnt work, also try to open this from the Run dialog:
C:\Windows\ImmersiveControlPanel\SystemSettings.exe
And tell me if it opens your settings. Please try this and let me know how it goes!