I posted to the Adobe Speedgrade forum but it seems they are only concerned with CC not CS6. I updated to Speedgrade 6.0.4 on my 8-Core 3.0GHz Mac Pro with 16GB Ram with an ATI Radeon 5870 running OS 10.7.5. It crashes at start up.
I uninstalled Speedgrade and reinstalled from the original DVD, (this is part of the CS6 Master Collection). I launch Speedgrade and it works. I run AUM and it wants to install 6.0.4. I let it and then it crashes at start up again.
This is a 2007 8-Core that has 32bit EFI so cannot boot into 64bit Kernel. Is the 6.0.4 update only 64bit that requires a 64bit Kernel? Adobe seems unresponsive so again, I'm posting here.