I've got good news and I've got bad news. I was able to open GSX using the hot keys.
I changed the hot key assignment for GSX to SHIFT+CTL+num0. But using that combo on my keyboard did not work. But, if I used just CTL+num0 combo on my keyboard, GSX would open, even though the mapping assignment for GSX stayed at SHIFT+CTL+num0. Only CTL+num0 will work. Now, if I change the mapping assignment to CTL+num0, then I have to use SHIFT+CTL+num0 to open GSX. But, either way, that's okay, it will work fine for me. The problem seems to be in the mapping assignment as long as I use the correct combo on my keyboard.
I just wanted you to know where the mix up was.