Error: Dispatcher processing has been suspended, but messages are still being processed. Occurs when posting to Code Expert.

Problem

When posting NC code to Code Expert or generating code from the Mill-Turn sync manager, a dispatcher processing error will repeatedly pop up. The user must force quit the Code Expert application in the Task Manager to stop the errors. All Mastercam releases of Code Expert are experiencing this issue.

Cause

This error is due to a recent Windows update. For Windows 10 users, it will be either KB5026435 or KB5027215 . For Windows 11 users, it will be KB5026446 or KB5027231.

Solution

This error can be fixed by changing the default printer to one built into the operating system, such as the Microsoft Print to PDF printer. Instructions vary slightly between windows 10 and Windows 11.

Windows 11

Go to the Windows Control Panel – Devices and Printers – Printers and Scanners page, Turn off the option to let Windows manage your default printer, and click the printer you wish to set as the default printer. On the printer’s settings page, select the Set as Default button. In the images below the default printer has been set to the Microsoft Print to PDF option.

Window 10

Open the Start menu and type in Printers. The first option will be "Printers & Scanners". Select that option. Next, uncheck the options near the bottom of the page to let Windows manage your default printer. Then select the printer you would like to set as default, and click Manage. On the printer's page, select the option to Set as default. In the images below the default printer has been set to the Microsoft Print to PDF option.

Alternatives

Another solution is to try installing the latest drivers for the default printer that is set in the Windows control panel.

If you do not want to change your default printer and are not running Mill-Turn, setting the default editor in the Mastercam configuration to Cimco will allow code to be posted and edited without any errors.
This is set in Mastercam by going to File – Configuration and selecting Cimco as the Editor in the Start/Exit section. Make sure to click the green check box to save these changes.

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