Try smart disable of all plug ins.. I think it's in the optinos menu or somethin.. maybe that will help!!
Most of people I've heard with the same prob ended up being a dodgy plug in or instalation of that same plug in!
DX i should retain the exact same properties... Reactor might b a bit 2 much 2 handle 4 Fruity.. r u using the Asio drivers in both?
Just for the sake of experiment try opening fruity from within SX .. now open reaKtor how does that go?
Z