A 6GB patch was released.
Quote:
A patch was released today for Injustice: Gods Among Us Ultimate Edition to fix several issues related to online multiplayer matchmaking and graphics card compatibility.
Players with Steam auto-updates enabled will automatically receive this patch. Please try out the updated game and let us know if you have any problems. Warner Bros. is actively monitoring posts in this Steam community forum.
List of Bugs Fixed
Fixed issues causing players to be stuck at the ‘looking for opponents’ screen
Fixed issues related to the Join Game system
Fixed a problem with players getting stuck in lobbies in Survivor if one player disconnects at a critical time
Fixed crashes related to Steam invites
Fixed a problem where players are unable to join a Player KOTH/Survivor match of 6 or more people if someone leaves
Fixed a problem where players get stuck in their own rooms and cannot progress in Survivor and KOTH matches
Fixed a problem where DLC characters and skins become no longer available after inviting a player to KOTH or Survivor that has not booted the game
Fixed a black screen crash when Shadow Quality option on NVIDIA cards is set to max --> Finally... 
Added proper support for NVIDIA Optimus chipset
Fixed a problem with ATOC support on AMD cards
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EDIT...
Well, the new update just fucked my game. LOL