I try to make myself short.
Whatever HDR picture or other file format I use I do not see any difference in Hugin, displaying the pictures when changing the curve correction settings in preference. Yes, I restart Hugin.
I'm on a Windows 10 computer.
And a normal HD LED screen.
I have the latest Hugin...
2016.2.0.be8da0221960 built by Thomas.
Do I miss something, should not the visual appearance change for the picture when making different settings for Gamma?
Apparently there was a bug in the Hugin software.
The info to me from tmodes in Hugin Launchpad tracker it that it's this is corrected in the 2016.4beta1.