Tron-like-Glow DX11 -> need HLSL help!

vvvv beta question
7

https://vvvv.org/sites/default/files/imagecache/large/images/BSOD.png

BSOD while playng with this patch.
NVIDIA Quadro 2000
Win 7 x64

During the patching the fan of the video card was going on and off…

So my questions are:
Is DX11 stable, or still work in progress?
The differences to set it up are more error prone than dx9?