Troubleshoot turning on Emit Ambient volume light attribute does not update the IPR render

User Guide > Rendering and Render Setup > Lighting > Basics of Lighting > Troubleshoot direct light sources >

If you are working with Maya in Mac OS X, turning on Emit Ambient in the volume light Attribute Editor does not update the IPR render. If you change the status of Emit Ambient, you have to modify another attribute of the volume light to get the ambient light to update correctly in IPR. From that point on, the ambient component of the volume light will display correctly in IPR.