When launching 3ds Max you receive an Error Loading Plug-in DLL dialog. The error states the mentalray.dlz file has failed to initialize:

User-added image

Upon using 3ds Max to render with NVIDIA Mental Ray or Iray, neither are installed and do not appear for selection in the Render Setup drop-down list under Renderer.


When installing 3ds Max with the Setup application (*.exe) file or installing NVIDIA’s separate Mental Ray plugin for the 2018 version, the Mental Ray files seem to be installed in the wrong folder or read incorrectly.


Install the newest version of NVIDIA mental ray and IRay ( for 3ds Max 2017.

Additionally if the issue persists:

  1. Copy all of the contents from Plugins\NVIDIA\Bin folder directly in the root directory: C:\Program Files\Autodesk\3ds Max <version>. (Do not Cut the contents from the folder.)
  2. Start 3ds Max again and the error should not appear and load the render plugins.


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