I am experiencing this issue with a few color formats.
CMYK in Print(Press Ready) The same cream colored white happens with every cmyk color profile, but not with rgb here.
Grey/8 & Grey/16 both profiles are cream colored as well
Lab/16 all profiles are the same as above, cream for white
With my monitor, I'm using the native color mode (Samsung Natural Color Pro 1.0 ICM) instead of Adobe RGB or sRGB IEC61966 to get actual white.