Thanks for the answer.
Before seeing it I tested the last demo and it works perfectly. Maybe it was a specific problem in the old file which was corrected with the new file ?
I don't know but it works and I have to say the game is amazing !
It really brings back memories of mmorpg and guilds problems ah, ah, ah.
On the game "game" part I always forget the mp with the potions before the first raid. Every time... Oups...
Anyway, I'll try to follow the steps of the resolution you described if I have a new problem with a future update. Thanks again !!!!!