Anyone Else No Longer Able To Host Any Worlds Split Screen Offline?

[Cog Sci Clinton]

We play split-screen local co-op offline DST on Xbox One. 

Is anyone else experiencing this problem? Or have any advice as to a remedy?

Tonight, we started up the game
(like we do most nights),
the game loads,
the intro plays,
my partner presses play,
she is prompted to sign into her profile,
then there is a loading modal,
then we're prompted and choose "play offline," 
the menu comes up,
I log into my profile (as second player),
she goes to the host screen and finds our world 
(everything is normal up to this point, then bad things happen)

before she even attempts to enter the world,
the screen goes black,
the game hangs up and makes a buzzing sound for about 5 seconds,
then crashes back to the Xbox One home screen.

We tried to open all the other worlds we have and the same thing happens. Basically, the game has become completely unplayable.

Any help is greatly appreciated.  The weekend is coming up and we'll soon be going into withdrawals!