@RunningSnakes @fledge68 hmmm I think I may have an issue in my setup.
I tried again today and all of the games are working.
Castlevania Rebirth
Contra Rebirth
Mario Tennis
Paper Mario
Majora's Mask
Ocarina of Time
Yoshi's Story
All games settings are set to default, except 'launch with neek2o' is ON.
But then more crazy stuff happened. My HDD has a led on top indicating activity. Very useful to see if it's freezed or not.
I noticed that my USB HDD was always loading, even if I change the emunand partition to SD and launch the game. I have the same folder names for emunand on SD and USB, but with different games inside. So, when I change partition I can really see that I'm on SD because the Total game count changes.
I don't how this can happen (bug?) but I went further, so I tried to set Wiiflow to 'SD Only' and launch the games.
Now the light doesn't blink anymore. In every sense.
Neek2o games are not working, eternal blackscreen.
The "normal" games are launching from SD, though, like Nebulus (C64), Megaman 10 (Wiiware) and Gaplus (VC Arcade).