I tried your way but failed. Before that, I tried reinstalling my Windows (I tried 7, 8 and 10) and everything repeated. The button does not work - there is no function to change the back board. I tried the older versions as well - they worked correctly several months ago .. but now it’s strange - they all do not work correctly with the background. I repeat, I reinstalled Windows many times, deleted the program using different uninstallers. nothing helps . I live in Russia .