CMD/up, used in both Dr Racket and Portacle (Emacs) to retrieve the last command in the buffer, has stopped working for both programs.
Other combinations with CMD do work, such as CMD/P, and CMD/X, CMD/+
I am using OS X, on a Macbook Pro
This seems to be related to a previous question (set-mark-command (C-SPC) not recognised/broken), however the stated solution for that question did not work (System Preferences > Keyboard > Shortcuts > Input Sources > Select the previous input source and uncheck). That question had assumed this was on the Emacs level but found it was on the OS level. That is obviously the case for me, as it affects more than one program.
I would greatly appreciate any help.