Issue:

It is not possible to load the Arnold plugin (mtoa.mll) in the plugin manager in Maya. The plugin may be listed, but clicking in the Loaded or Auto-Load field in the plugin manager does nothing. The error “A dynamic link library (DLL) initialization routine failed.” may appear in Maya.

Solution:

To solve issues at loading the Arnold for Maya plugin, chose from the options:

Reset the Maya user preferences and update Arnold to the latest version

  1. Close Maya.
  2. Reset the user preferences by following the steps from this article: How to reset the Maya Preferences to Default.
  3. Download the latest Arnold for Maya plugin here: Arnold for Maya.
  4. Start Maya.
  5. Open the Plugin Manager and search for mtoa.mll plugin.
  6. Click on Load or Autoload to load the plugin.
  7. Press Close to confirm and close the plugin manager window.

Uninstall the Arnold MtoA plugin and re-install the software (Windows)

  • Uninstall the Arnold plugin from the installation folder of the previous version of MtoA:
  1. Go to C:\Program Files\Autodesk\Arnold\maya2020
  2. Execute the file Uninstall.exe to uninstall the program.
  3. Download and install the latest Arnold for Maya plugin from here: Arnold for Maya.

Note: This example is regarding Maya version 2020. Search for the appropriate version that you are using.

  • Use the Add/Remove programs function in Windows:
  1. Click on the Windows Icon.
  2. Type Add or Remove.
  3. Click on Add or Remove programs.
  4. In the Apps and features window, search for MtoA.
  1. Uninstall the program.
  2. Download and install the latest Arnold for Maya plugin from here: Arnold for Maya.

Perform a Clean uninstall of Maya

  1. Follow the guide to completion: Perform a clean uninstall | Download & Install | Autodesk Knowledge Network

Source: https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/Can-t-load-the-Arnold-plugin-in-Maya.html?us_oa=dotcom-us&us_si=e1c6dff8-02cf-4063-a7dc-1cf89b8550d5&us_st=Arnold

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