Same problem here.
Please fix this asap!
The studio is aware of this and investigating. This is listed under the 1.2 Patch Known Issues List.
same problem right now even when bind to other keys. Only work for me when i open up the med inventory and left click to use.
The studio has been informed and they're looking into it.
Alright. Well just for reference, I tried repairing the game, as well as a full uninstall/reinstall. Still doesn't work.