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Hi Adrian,
Thanks for posting in the community. We are happy to help you.
According to your description, the situation may be caused by your template, existing add-ins, or any macros in your Visio. Please try the following steps to troubleshoot it further.
- Please try to create a new drawing based on Bsic Diagram or Blank Drawing. Check if the situation still happens or not.
- Please check the existing add-ins.
Click File> Options> Add-ins. If you can find any add-ins, please click Go> untick the related add-in and click OK. After that, please check again.
- Please check the existing macros
Click the Developer tab> Visual Basic. Check if you can find the Module files.
We look forward to your response. Thanks for your cooperation.
Sincerely,
George | Microsoft Community Moderator