I also had an uncooperative back and found it to be the button that released the latch. Oddly enough I have a few dark slides and one does not work as well as the others yet they seem to be identical other than two rectangular forms near the handle one raised on one side and the other depressed on the side of the raised one. My suggestion is that if the one you are using does not have that feature and you can get one that does it might solve the problem.