I created simple app with two VCs.
I open second VC from first via button. Seque is \"Present Modally\" and transition is \"Partion Curl\". This scheme works fine on iOS
This is either a bug, or (IMHO) an indication from Apple that this ModalTransitionStyle is about to be deprecated. Since it is probably the last vestige of pseudomorphism, I think that's a safe bet that it is short for this world. I was debugging an issue for hours with regards to inconsistent touches on a modally presented viewcontroller, using this transition and pulling my hair out. I switched to another modal transition style and POOF - all issues caused by iOS8 are gone.
Keith