I’m also having something kind of similar. I’m ruining BigBox 8.5 and have noticed sometimes the back button doesn’t work and as a result I am stuck in the game launcher screen. I still have control of the joystick but when I click to back out of the screen it makes the sound effect and looks like it’s about to go back to the platform screen but doesn’t preform it.
I’m using a Tankstick as well. So, its setup through keyboard on BigBox. Also, when I exit from BigBox and open BigBox again, the issue is resolved. It seems to only happen when I enter a game and go into view manuals or pictures on the game and then exit it will sometimes happen then. After this I can’t exit from the game to go back to the full platform game list.
This did happen while using Launchbox and has happened since I have started using Launchbox.Next as well. Again, this is only when in Bigbox and havent seen any issues while using Launchbox or Launchbox.Next.