To reproduce:

1. Run this (any time -- it doesn't have to be part of the startup sequence):

   Document.globalKeyDownAction = { |doc, char, modifiers, ascii| ascii.debug };
   

2. Hit a few keys in the code window where you did 1, to verify that the ASCII codes appear in the post window.

3. Ctrl (Cmd) N to create a new code document.

4. Start typing. ASCII codes don't appear. (Though, strangely, the return key will cause 13 to be printed, at least in Ubuntu.)

If it's a global key down action, then it should apply to all documents, not only the ones that existed when the language initialized.