Summary

If GibbsCAM displays an error referencing mw5axproc.dll during startup, the issue is typically caused by a corrupted MW5AxProcSession.ini file used by the Multi-Axis Processing plug-in.

Deleting the session file allows GibbsCAM to automatically recreate it the next time the software launches, which typically resolves the issue.

Table of Contents

Before You Begin

Before performing the troubleshooting steps:

  • Close all instances of GibbsCAM.

  • Ensure you have access to your Windows user profile.

  • Administrator permissions are not normally required.

Note: Deleting the session file does not remove your GibbsCAM installation. The file is automatically recreated when GibbsCAM starts.

Procedure

Step 1 – Close GibbsCAM

Close all running instances of GibbsCAM before modifying any configuration files.

If necessary, verify that no GibbsCAM processes remain running in Windows Task Manager.


Step 2 – Locate the Session File

Browse to the following folder:

C:\Users\<username>\AppData\Roaming\Gibbs\GibbsCAM\<version>\Plugins\data\MW5AxProc


Locate the file:

MW5AxProcSession.ini


Step 3 – Delete the Session File

Delete the following file:

MW5AxProcSession.ini


Tip: If preferred, rename the file (for example, MW5AxProcSession.ini.old) instead of deleting it. This allows the original file to be restored if necessary.


Step 4 – Launch GibbsCAM

Restart GibbsCAM.

During startup, GibbsCAM automatically creates a new MW5AxProcSession.ini file using default settings.

Expected Result

GibbsCAM starts successfully, recreates the MW5AxProcSession.ini file, and the mw5axproc.dll error no longer appears.

Additional Information

What Causes This Error?

The mw5axproc.dll error is typically caused by corruption within the MW5AxProcSession.ini file.

This file stores session information for the Multi-Axis Processing plug-in. If it becomes damaged or contains invalid data, GibbsCAM may fail while initializing the plug-in during startup.

Deleting the file forces GibbsCAM to generate a clean replacement.

Common Causes

This error is commonly caused by:

  • A corrupted MW5AxProcSession.ini file.

  • An unexpected shutdown while GibbsCAM was running.

  • Corrupted user profile data.

  • Interrupted write operations to the session file.

Best Practices

  • Always close GibbsCAM normally before shutting down Windows.

  • Avoid manually editing the MW5AxProcSession.ini file.

  • If startup issues occur after an unexpected shutdown, reset the session file before performing a complete reinstall.

Troubleshooting

  • Problem: The error persists after deleting the session file.

Possible Causes

  • Another configuration file is corrupted.

  • The user profile contains additional damaged settings.

  • The GibbsCAM installation has become corrupted.

Resolution

Run the Recovery Tool. If the issue continues, perform a clean reinstall of GibbsCAM after deleting the User Preferences folder.


  • Problem: The MW5AxProcSession.ini file is not present.

Possible Cause

The file has already been removed or has not yet been created.

Resolution

Launch GibbsCAM. If the file is not recreated and the error continues, run the Recovery Tool or perform a repair or reinstall of GibbsCAM.

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Keywords

Mw5axproc.dll, MW5AxProcSession.ini, Multi-Axis Processing, Startup Error, Plugin Error, Crash on Startup, INI File, Configuration File