To be clear I don't have this problem with pretty much everything else that I run through Big Box. All other games and emulators work just fine without issue. Perhaps it's because Minecraft is a Windows App that is causing the extra grief? This is the Windows Store version of Minecraft which has full controller support... perfect for a Big Box setup. Mapping alt-tab to the controller through xpadder would probably work I'm sure although I really would like to avoid xpadder if at all possible. Nothing else needs it and it really shouldn't be necessary.