Oddness with stage and stage-mobile

[LCMark]

Just a quick question in case any of you have seen this before... To build the Mac and iOS components we use two top-level xcodeproj's with an 'Aggregate' target. However, since making some modifications to them for 6.0.1 they've started to report an error after all the components have built (PRODUCT_NAME is not defined).

Anyone have any idea why this might be? Michael and I have poked around a fair bit but can't seem to find the cause, while not fatal (the error occurs after all the referenced targets are built), it is still irksome.