Maxtoa has been updated to accept the new Arnold 7.1.4.
The new update has automatic generation of TX files always on, where the textures are generated on demand. MaxtoA now supports the standard object properties, like visibility spinner and different visibility flags.
Arnold Render view is on by default. Physical materials are translated to arnold way more efficient. Arnold representation for standar surface on viewport is now working.
Sharper textures trhough reflections and refractions.
And multiple USD enhancements, with materialx Shaders suport, alembic support, imager support and more.
For more information check the release note here