Good day!
As most of you already know, there is an iGameGuardian hack available for Need for Speed: No Limits, posted here and here.
Now there has been a problem for some of us who modified the price of crates in the Loading Docks, which corrupts the savegame linked to the currently logged in GameCenter account, thereby blocking access to the game using said GC account.
But after a bit of desperate tinkering, I have discovered a simple trick that erases any corrupt game data. This method will cause you to begin from scratch, but your Game Center account will be usable in NFS:NL once again.
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I hope this helps some of you who can't play the game. I was surprised myself when this happened, cheers!