>> Total black should be unaffected by any gamma correction...
>
> Indeed, that's why gamma and ambient-light can't do the same thing.

The OP apparently has(had?) two problems:

1) Even with no light sources and ambient light turned off the scene was not 
black.  AIUI this would be a bug as the output should be totally black no 
matter what the gamma setting is.

2) All scenes look lighter in 3.7 compared to 3.6.  This is because 3.7 has 
gamma correction applied by default.  You should fix your scene to make it 
look how you want (because you need gamma correction to make the lighting 
look physically correct on your monitor), or if you're lazy just turn off 
gamma correction to get the same output as 3.6 gave by default.

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