Hello.
EDIT: ...maybe a HDD/USB Device Initialisation Issue ?
Thank you.
strange. because before that version all worked without problem. i have 2 hdds connected to the wii u simultaneous. both are wd my book usb 3.0 with 2tb. one for the wii u games and one for gamecube, wii and wiiware games hidden with ustealth. i will try later or tommorow to disconnect the wii u hdd and try it only with the gc and wii games hdd.