Thanks @Claes. Uninstalled v5.8 and reinstalled v5.9. Here’s the output, unfortunately v5.9 is still not behaving.
First up your output profile with camera profile, all else default.
Then I tried your output profile with the standard camera input profile.
In desperation yesterday, I had also tried forcing exif values in the file exported from RT v5.9 - to no avail.
exiftool -q -q “-ColorSpace=sRGB” RT.jpg -overwrite_original
exiftool -q -q “-DeviceModelDesc=IEC 61966-2.1 Default RGB colour space - sRGB” RT.jpg -overwrite_original
exiftool -q -q “-ColorSpaceData=sRGB” RT.jpg -overwrite_original
exiftool -q -q “-DeviceModel=sRGB” RT.jpg -overwrite_original
exiftool -q -q “-ProfileDescription=sRGB IEC61966-2.1” RT.jpg -overwrite_original
I even took the profile from a file generated via LR and patched it into the RT file. No dice.
exiftool -icc_profile -b /Volumes/stuff/Pictures/OUT/X10012149_F5.6_1-1300s_ISO200_PROVIA_35-LR.jpg > profile.icc
exiftool “-icc_profile<=profile.icc” RT.jpg
Ran out of ideas now.