Hi jsrfded,
If you're using the Fusion Tech Preview on Mavericks running on certain models of Mac, you'll need to disable 3D accelerated graphics in your VM's Settings> Display... it appears that a change in the graphics stack in Mavericks is incompatible with a change in the Tech Preview, which we'll have resolved in the near future.
If disabling 3D acceleration doesn't help, please post a support information bundle and we'll happily investigate!
Cheers,
--
Darius