I cannot copy and paste, neither by right clicking nor by ctrl-c and ctrl-v. I first noticed it in Excel, and I cannot use the buttons under Home to do it either. I tried the cmd /c"echo off|clip" that is suggested by people on the internet, but it doesn't help. (It may only help with the mouse method anyway.)
When copying in Excel, it allows me to choose copy, and the border of the cell block goes dashed for a bit, but it stops and Paste is not available. If I open up the clipboard I can Paste Values, but that is not helpful for what I am doing. The clipboard doesn't have much in it. Clearing it does not help.
I am also using Gmail and I can't copy from there. I can't copy or paste in this window. I'm using Firefox. I can't copy, or certainly not paste, in Word.
I don't know if Ease of Access is the correct Windows Topic, but I don't see one for general getting things done. Maybe Performance and System failures.
I've tried rebooting. I emptied my Recycle Bin.