I'm very upset over Lion and think it's the worst OS X release since 10.0 which was a disaster. I find Lion extremely sluggish and somewhat buggy, and as I see it, it's definitely not ready for primetime. One of the things that makes me mad is that Virtualbox doesn't work anymore. I have a bunch of virtual machines I need to run (OpenBSD, NetBSD, Windows XP and 7) and in Lion, Virtualbox (4.0.10) crashes when one tries to start a virtual machine no matter what guest OS (they don't even survives past BIOS boot). It worked flawlessly in SL. Is there anything I can do except revert to Snow Leopard? I have already tried to disable VT-X, 3D, PAE/NX and IO APIC in Virtualbox, but no go.