i never had rendering in a seperate process on and i tried rendering with the basic options as well as with shadows etc on... and still no joy... i have now returned my P7 back to its JPG hating old pre SR1 self, at least it renders...lol
Perhaps SR2 will work.... or maybe P7 will be my downfall.... and i should wait till P8 lol

Getting old and still making "art" without soiling myself, now that's success.