I downloaded this and modified the window size parameters to fit my screen. It worked fine for a while. Then I closed QKM, opened it again, and this shortcut gives an error saying the second created window (which is the one on top after both are created) could not be resized. I changed the size to some other values, changed it back to the size I want, and it started working again. If I close QKM and reopen it, the whole cycle of errors and fixes starts again.
Any clues on how to address this?