Yep, with a clean format of my SD card.
Credits to Linkx for tha fix

I'll try again those games that didn't worked before, maybe that will fix them too

EDIT :
Yep, I can confirm more games are working now.
I got a bit anger for nothing then, the compatibility is pretty good ^^;
I'm sorry...
So the fix is : Format your card.
I'm still very happy though that a new firmware is coming, I hope good stuff will come with it
