I just purchased Cubasis 2.7 myself. It’s running fine. The in-app purchase of the waves plug in bundle worked out fine. I tried to buy the FX Packs but now I get the in-app-purchas error like Dmitriy. I tried all the other in-app purchases too but get the same error every time. I checked my payment settings in the App Store, I logged out of the App Store, reset my iPad and logged in again… same result. Please help!