Yes, the hook is destroying the inputs. (EDIT: Oh, and thanks for giving it a shot!)

I've created a new Unicode hWnd window with the same/ default on_message engine message loop. That one is receiving the same messages as the default engine window, so the issue must be somewhere else (in the message loop itself?).

I don't think I can do this on my own.
Mr. Lotter, do you have any advice?

Thanks.