I have a SGSII using the beta version of the Logos app. Both Beta 2 and Beta 3 give me problems downloading some of the books in my library. It seems random, because some books will download and install, some won't. I've checked my library on my Mac and the books exist there, and the Logos website says the books are compatible with mobile devices. I believe the successful downloads are regular books and the failed downloads are bibles and resources, but that seems to be the only commonality.