Wonder if related to auto-smash-booting?
By WiiU screen just a white(ish) screen with the WiiU logo center and some edge decals?? I waited about 45 sec after Mii Maker on that screen before it kicked me back to the home menu so I could load smash
When i exit the game i get a white screen with the wii u logo center and the screen is stuck at this point. I waited for more than 5 minutes but couldn't get to home