Care should be taken when transitioning scenes to Maya 2017+ from previous versions of Arnold for Maya as some fundamental changes have been made to the Color Management and .tx texture workflow. These changes are listed below. For further information, refer to the Arnold for Maya 2017 release notes.
Autodesk Color Management (also known as the Synergy color management component, or SynColor) is a shared technology component that is integrated into several Autodesk applications. This allows for consistent processing, interpretation, and communication of colors throughout a mixed pipeline. Autodesk Color Management is designed to support a variety of color management methodologies, including ACES, ICC, OpenColorIO, and ASC CDL. It allows you to work with different color spaces and encodings so that you can adopt new workflows or emulate legacy ones.