I don't know if I ought to be concerned or not about this new little glitch. 
It just started this morning for no apparent reason. 

About 1/4 of all my icons get turned black. This happens when I switch 
screens, for example, but I can't get a screenshot of *that*; so the best I 
can do to show what I mean is a screenshot inside one of my folders, where 
you can see most of the icons are turned black. 

Not all are turned black, however. I tried to find some common characteristic, 
but there seems to be none. It is not just folder icons, or icons of 
packages, or icons of a certain kind of file, or anything that I can tell. 
This also occurs in icons when I am switching screens, or the view within 
folders, and it also occurs in some of the icons that are incorporated within 
the folder view -- for example, in the border of some windows. 

It doesn't seem to affect anything else. It's just annoying, and I don't like 
not knowing the cause, or how to fix it. 

Any ideas what's causing this thing? 

Bill

P.S. See attachment for a screenshot. 

Attachments:

• screenshot-icons_black-20200625_0941.jpg