Shouldn't all of these troubleshooting questions have been asked maybe a few years ago when this problem started?
There's no consistency about it. I can highlight text, right click, physically move the mouse pointer down to copy, click on copy. Then move to another application, right click, and either paste is grayed out or if it's not, I hit paste and it pastes what was in the clipboard prior to what I copied in there.
I try it a second time and it works. Before anyone asks, there's nothing wrong with my fingers, keyboard, or mouse.
This is not a new problem, nor is it one being imagined by people, nor is it because people are too lethargic or stupid to know that they clicked copy (or CTRL-C)., It's been going since at least XP, and during that time, the primary culprit was Internet Explorer.