There is some strange behaviour in keypress handling when you stroke in the same time the Ctrl or Alt modifier with a numpad key different from 0 to 9 keys.
No keypress callback is received… I experienced this trouble by playing with KeyMappingEditorComponent.
Note that it works without any problem under macosx.
I also test this in Tracktion demo (18.104.22.168 - ok, that’s maybe not the most recent one !) and it works differently for these particular keypress. It just understand ctrl+M for Ctrl+numpadminus and ctrl+K for ctrl+numpadplus (idem with Alt).
Could you please check this ?