You could try doing a clean installation, maybe you fucked something up. Shouldn't be having a problem if you don't have the ini set to read-only or anything like that. I wouldn't really recommend using those Switcher features, anyway, they're sort of buggy and caused me to lose all of my save files once.
To be clear, you know how the weapon-switching controls work, right? It's not like style-switching with the d-pad, you just use the triggers to cycle through all five options.