Okay, I think I have narrowed down the issue. It does not have anything to do with the Excel images that I am copying. What is triggering the shortcut keys to stop working in AD is when I toggle to another app using the "Alt-Tab" Windows shortcut. If I navigate from app to app using either the mouse and the program icons or even the "Windows-Tab" shortcut, everything seems to work fine. It's only once I use the "Alt-Tab" to navigate away then back, does the issue pop up again.
Seems to be a AD bug to me, but maybe with Win 10, the preferred program/app navigation is "Windows-Tab"?? Have not run into this with any other Windows program I use.
Any thoughts about this would be appreciated.