I know there have been many past threads about issues like this, and I think I have read them all, but I haven't found a solution.
I have Big Box added to Steam as a non-Steam game/shortcut. I can launch Big Box through my Steam Link just fine. However, once Big Box has started, my controllers (Xbox One controller connected to the SL via Bluetooth or Xbox 360 controller with official Microsoft wireless adapter) are not recognized by Big Box for input.
I should note that if I start Big Box on my PC in Big Picture mode (rather than through the Steam Link), the controller works. It's only when BB is started through SL that it stops recognizing the controller.
The really frustrating part was that it DID work when I first installed Big Box last night and then stopped for no reason I can discern.
Thanks in advance for any advice anyone can provide.
