Material Function - Copy/Paste

I can not copy to be able to post nodes from one material function to another. Just can’t copy period and I checked every last key-bind to make sure but still no luck. How can I get past this. please help

Copy / Paste (ctrl+c / ctr+v) generally works for this. Assuming this is a Windows machine. Is there a specific node that you’re unable to copy over?

I do apologize in this matter. Yes it is windows. The problem seems to be that my CRTL key no longer wishes to work period.I do appreciate the attention you have given. thank you.