My replacement came in two weeks (arrived to Sept 1). It still had the Centerfold issue, and added to that two large diffuse pink blotches (ala Phase One LCC for those of you who know what that looks like). This is all fixed with the Gain Utility, so the problem in not any worse than the first back. It seems that among this crowd, I might be one of the first to have received a replacement. Apparently the people at Leaf headquarters did not know what they were looking for while testing the backs. FYI, The back works as it should with an H1 ... No Centerfold, and no color casts. For anyone using a camera with a mirror box this is a non-issue... ( at least until you try to sell the Digi-back and have no way yourself to tell an architecture, landscape, or view camera shooter whether the back you are selling has the centerfold feature or not).
Update... Apparently Leaf sent me the wrong back, during the Friday afternoon office jugling contest the one they sent me accidentally ended up in the good pile.