Had to rebuild my MBP from scratch yesterday thanks to a bug in the App Store I couldn't get rid off. Once I attempted to reinstall FCS2 (still waiting for an upgrade to that one - FCS3 didn't really cut it for me), I was told that FCS needs Rosetta and asked me to install it. After the Rosetta install, FCS was loaded perfectly into the machine. Does that mean that you won't be able install FCS under Lion? If I upgrade from SL, I want to do an install from a wiped drive.