Thank You P1LGRIM .
I deleted AptioMemoryFix.efi and add " AptioMemoryFix-64.efi " .
Then everything just works ! even the iMessage ,
I have the iMessage issue problems for many years , it just works !!
After Installing Mavericks and use for a while .... Launch Messages make your mouse slow and lag then crash
just go to System Preferences > Network
and kill the network service and reboot and add again ...
Messages should work okay
I do the Same Clean Install.
GTX 560 Ti
1. Clean Install with Unibeast - ML 1.7.0 to Install Mac OS X 10.8.3
2. after boot , Install MultiBeast ML 5.2.1
3. but when finish the installation ... seems to have some problems ... (and I try to reinstall many...