Can't advance past the main menu


I'd appreciate it if anyone can help me work around this. After about 11 hours of playing, I set the game to "controller" instead of mouse and keyboard. My controller is a Xbox Elite, which works with every other game I have loaded on this thing. Long story short, it doesn't work. It doesn't move the highlighted selection on the main menu. Keyboard and mouse do nothing (presumably since I changed the setting to controller). I tried updating it, plugging it in, testing it out in "windows controller" (the remote is responsive there), restarting the PC, reinstalling the game, updating the xbox accessories app ; all to no avail. 

So now I'm stuck at the main menu of a game that I'm enjoying, but can no longer play. Anyone offer any assistance here? 

Can't advance past the main menu
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