Mac OS X 10.7.3 with Xcode 4.3: This bundle is invalid. Apple is not currently accepting applications built with this version of the OS.

We have a few Mac applications on which we need to enable the Lion sandbox and resubmit to the Mac App Store (Mac, not iOS). I already applied the combo update 10.7.3 and after that I started getting this error: “This bundle is invalid. Apple is not currently accepting applications built with this version of…

Interface Builder not in sync with Xcode: can’t see images classes and project status is yellow or gray

Ever since upgrading Apple’s iPhone SDK to 3.2 beta and 3.2 final now, I started experiencing this issue: Interface Builder (IB for friends) didn’t recognize, show or list the images in “nib” files associated to an Xcode project. Other symptom of the problem is Interface Builder not being kept in sync with an Xcode project…