Thanks John and Walter,
If you mean clipping in LR 4, you are correct, because what is shown is after the attempts to recover the info.
Recovery is not necessarily perfect. This is why it is best to keep the LR brightest tones at ~75% or below.
I completely ignore that, but always keep the brightest tone @80%, thanks for explanation
I don't know how Sony computes histograms. Canon doesn't use the RAW data but the embedded JPEG to calculate those and highlight clipping warning is a mixture of all channels put together and this is called "luminosity".
You know there is a JPEG stored in each RAW file?
Because "luminosity" is a weighted function of those RGB channels you might see warnings where no clipping occurs and you may see no warning but clipped channels.
Therefore: Works as designed.
What's up with the CR you choosed? Do you have clipping problems withing LR? Go to "Develop", press "ALT" and left-click on the "Exposure" slider. Pictures will turn black and only clipped areas will be shown. Those are increased if slider is pulled to the right.
I've texture problems, but it appears to come from "out of Gamut" colors !
So, next buy, a new screen