I use the FX packager of FX 8 to construct a DMG on MacOS 10.7.
This DMG installs fine on 10.7 but fails on 10.8: see attached picture, it is what you get when dropping the app onto "Applications" in the DMG's window.
Of course one can drop the application elsewhere then it works fine.

For some reason if the same DMG is built on MacOS 10.8 then I can install it fine on both 10.7 and 10.8: is it the "standard" approach ? or should I be able to construct my DMG on 10.7 ?