Thought I’d chime in that I’ve been running Cubase 7.0.6 64-bit on a guinea pig Mac Mini upgraded to Mavericks. Cubase seemed to run without a hitch the first day or two. But after some days have passed and a few reboots later, I am getting Cubase crashing on launch. However the second time you launch it, it seems to run OK but you will get the “Searching for Video Service” window. If you cancel out of it, sequences seem to run fine but I don’t run video in my sequences so I don’t know what impact it would have otherwise.
I’m using an Apogee Ensemble with updated Mavericks drivers, and I think these crashes have been been possibly related to the drivers.