Yup, fresh install, as I deleted it before trying and so reinstalled the game in order to check. I made a thread about the absence of iOS8 fix from Square and Capcom and... not a fuck was given. Which is worrying because either I have said something really stupid or no one care about "old" games.
But you make me doubt, I should try to restore my purchase of the IAP and try again. For information - Ipad 4, iOS8, shit ton of bookmarks open in Safari but I closed it and only had the game running.
On another note, two soft launches on the Canadian Appstore, Seabeard and Yu-Gi-Oh! Duel Generation. Why did I never made an account there ? :-S
Edit - Lol ok, the game crash when you touch 'restore purchase'.