Maya color management
Maya saves the Color Management setting on a scene by scene basis instead of saving it in the window or user prefs.
MEL command to disable it
You can use “color management policies (external preference files)” to Disable Color Management.
http://help.autodesk.com/view/MAYAUL/2016/ENU/?guid=GUID-AE1F72ED-FA00-4E81-8027-785E3D6058F7
-The policy file overrides the effect of the OCIO environment variable.