My settings:
https://s1.bild.me/bilder/110417/1633104EmEditor_ActiveString.png
I’m just taking an example. The macro is not necessary. You can set another Action to reproduce the issues.
>What is the Application key?
Maybe you call it “Menu key”:
https://en.wikipedia.org/wiki/Menu_key
http://robburke.net/images/KeyboardApplicationKey.jpg
It’s recognized as “Application” in EmEditor (shortcut settings).
>How did you assign your key?
We were talking about this key and I haven’t assigned it to anything since you said you would disable the ability:
https://www.emeditor.com/forums/topic/shortcut-key-issues/