Hi,
I can successfully load content and play single games but I cannot get playlists to work. I’ve tried the macbledo web based playlist builder and while it was successful in generating a playlist that I was able to get to show up on the xmb, it still says cannot load file every time I select a game. I have the no intro rom set and have also tried to use playlist buddy. That also generated a playlist that shows up on the xmb, but when I go to select a game from this playlist it shows random cores to chooses from and none of them are the nes cores.
DONT GIVE UP !!!
I'm no expert, but I did manage to set up the playlist on my wiiU retroarch and now it works, displays the thumbnails and launch games perfectly fine, so I'll try to help you !
I use the no intro roms like you, and I did use an online playlist generator (found it here).
Because your WiiU displays the playlist but cannot load the roms, it seems to me the problem may be that : the rom folder written in your playlist doesn't match the real rom folder in your sd card.
See what I mean ? It shoud be something like : sd:/rom/...
Can you check this in your playlist ?
(You can paste a few line of your playlist here and I'll tell you)