This is a real mystery!
I have also made the lower two layers invisible to get the colour-picker readings, or changed the Tone layer to Normal - both give the exact same results.
Thanks for your efforts.
Problem solved!!!
The problem was caused by a strange entry in my contextrc file - (opacity 0.55999999999999994). Where this came from or how it was created is anybodies guess!
Many thanks to programmer_ceds and Ofnuts for their help.
I have also made the lower two layers invisible to get the colour-picker readings, or changed the Tone layer to Normal - both give the exact same results.
Thanks for your efforts.
Problem solved!!!
The problem was caused by a strange entry in my contextrc file - (opacity 0.55999999999999994). Where this came from or how it was created is anybodies guess!
Many thanks to programmer_ceds and Ofnuts for their help.