There is a known issue with Windows XP and we have been told that has been fixed and we'll see it in the next release.
For Tier 1, you currently cannot create an Xcode project based on the interpreter_ios Xcode project (the method used for creating iOS apps for Tier 1). There are two reasons for this, one in common with Tier 2 compiles across the board. The one unique to Tier 1 (as distributed in the beta) is that requires two libraries that aren't part of the standard setup: libGoogleAdMobAds.a and libOAuth.a.
The problem in common for both Tiers, all platforms, is a set of missing include files (header files):
3DMath.h
AGKLights.h
cCamera.h
cObject3D.h
sha1.h
../Collision/CollisionIncludes.h
The last is curious, but is included in agk.h with the others that are missing.
Additionally, at least for the native iOS projects, it is clear that the core AppGameKit files are very out of date. But they have been for a while, so that is nothing new.
Please feel free to add any other issues you've run into.
Cheers,
Ancient Lady
AGK Community Tester