I have no idea what happened, but everything was working fine on the MBP. I now believe something was wrong with the file.
However, I returned the MBP and got a 21.5" iMac. 2.7 GHz, i5 quad with the 6770, 512 MB GPU. Wow, what a machine! I haven't had a desktop in decades and this is real treat for me. SU is blisteringly fast on this thing.
Cheers!