Hello. To make problem easier to locate - this is my work environment: OSX 10.7, InDesign CS 5.5, Mag+ 3.2, new iPad (retina) with Mag+ Reviewer 3.2 with last update, additionaly iOS 5.1 simulator.
I start to learn Mag+ environment and i found it very clear and friendly and when I test single vertical directly from InDesign it works well on both real iPad and its simulator. Problem occurs on stage of building issue in Mag+ Production tool: single vertical or set of them exported to simulator (whether set as Retina or not) works fine, but the same MIB uploaded to real iPad makes Reviewer to show only blank pages in background colour set in Mag+ plugin. No layer B nor A - the same blank view fullscreen and in page scrubber. Content on these pages was nothing complicated - just placeholder text in few colours. But I took also your pop-up sample file - the problem repeated.
Files were exported as MIB 3.2 with iPad display resolution first, and then to the retina resolution with same results (but always in Mag+ Production Tool there is listed Device: iPad_1024x768_132).
I own no iPad 1 or 2, so it'll be harder to check if it occurs on these devices.
Thank you in advance for checking the source of this problem.