Thanks for your answers guys.
The directX11 build “vvvv45alpha29.3_x86_dx11” worked pretty good for me. I had some not reproducable problems with cloning templates, where I was not able to clone. It fixed itself after some restarting action.
I also had virtually no problems with nVidia Optimus on my Windows 8 machine, besides some grey renderers.
Seem gray renderer on start come from some wrong AA settings in renderer, setting quality to 0 should fix it (works in dx11 hw, but not in dx10/10.1 hw)