Same type of issue. Copy/paste/cut and rename become randomly grayed
out. Usually this happens when I first open the file manager and then
begin to open a few other folders as separate tabs. I have also noticed
this issue randomly happening when having several tabs (just mentioning
this because
Found an okay work around. Install KCharSelect which allows you to
enter a search item. So if you want a variation of "n" then type n and
search. Don't know about other characters which aren't related to the
alphabet.
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