The Render Message window displays errors and other messages from some renderers (though not the Default Scanline renderer).
Example of Render Message window
Three status fields appear above the messages area, on the right side of the window:
In addition, the message area is organized into three tabs (for the distinctions between the Production, Material Editor, and ActiveShade renderers, see Assign Renderer Rollout):
When on, the Message Window is displayed if the renderer logs an error message. Default=on.
This is identical to the Rendering preference, Open Message Window On Error. 3ds Max synchronizes the state of the two toggles. See Rendering Preferences.
Click to clear all messages from the messages area.