Well, the game decides to crash when Split Screen is turned on.
Device: Acer Spin 1 (lowest end model)

Steps to recreate:
1. Get a mug of tea, because you might be using your head for this.
2. Plug in two controllers (I used Xbox 360 controllers)
3. Load up a world (Steps 1 and 2 can be interchangable)
4. Make sure that you are using the Xbox Controller (probably Player 1) to use MCW10B.
5. Press Start on the second controller
6. Just watch in disappointment when the game crashes.

My preferred way of fixing:
Allow split screen for Windows 10. It sucked to not have it in Star Wars Battlefront (PC)...

Obviously, I cannot add a screenshot, and this computer probably can't record, so no attachments. :'(

Well, have fun fixing this bug! Lots of people will be excited if split screen is allowed in Minecraft: Windows 10 Edition (beta for now)!