Looks like something to do with ATI 2600 and last sec update
I just took the ATI HD 2600 XT out my 2007 MP, and looks like Aperture is OK.
I have been out traveling this week, and when I just booted, applied upgrades and reboot alter aperture upgrade came up... and it stop working?
I removed Aperture 2.1, loaded my 2.0 DVD and reinstalled. Rebooted, then repaired permissions, then rebooted. After that, still did not work.
I then shut down the system, removed ATI card out form slot 1, and left my 7300 on slot 4. booted back up and it is working...
I guess I will try to remove the 7300 and leave the ATI card in and see what happens?
JM