I’m seeing this as well.
Occuring when I just move the mouse around, as well as clicking on navigation elements. And when at the top of a page, when I use the mouse wheel to scroll up.
Same system info as OP.
@dylan It might help - but I’ve just noticed that when I turn off HDR in Windows, and restart Roon, the artifacts go away.
@jcgallagher - Are you also using a HDR screen?