Ok, let me try to clarify...
@Darryl, I am not using LR1, i have no clue what part of my post suggested this but I am using Photoshop CC (2014) and LR CC also.
With regards to colorspace I am used to use Prophoto RGB as this should be the largest color space available. I use 8 bits because of the fact that 16 bits slows down considerably and produces very large files.
The lightning I used yesterday was a beauty dish and a small softbox. Nothing out of the ordinary. We also used a Nikon D800 and there are no problems with the RAW files out of this camera.
As soon as I get home I will try to post an example of what I am talking about. Maybe that will help.
Thanks for all your reply's... I really appreciate this
Frédéric