I have to commend @Franzgrim once again, for providing the feedback that this is happening over at the Mint forums.
Turns out this is graphics type specific ...
a) I updated my two Dell laptops with no problem.
b) I updated one of my desktops (of two) and after the update, Chrome, Chrome Beta, Brave are all affected.
(Opera and Firefox are fine).
My desktops have AMD Radeon RX for graphics.
The laptops use Mesa Intel UHD Graphics ... NOT affected.
If you read the complete thread via the link provided by @Franzgrim ... you will see where someone figured out an easy fix. I will quote the fix just below ... I executed the fix on the affected desktop and it fixed ALL the affected browsers !! (though i renamed the directories, vs deleting them)
Here's the fix (this quote is verbatim):
I found a fix for this problem that works for me.
Credit to this reply on reddit.
For each affected app, I had to delete the associated GPUCache directory.
I ended up having quite a few, and found them with:
find ~/ -type d -name GPUCache
I also ended up deleting all of them
together with:
find ~/ -type d -name GPUCache -exec rm -rf {} +
but do so at your own risk.
Hope this helps others ...