Refresh Custom Ribbon not working

Hi,

I am trying to share some macros created in Word with my colleagues. I have created a custom tab and added macro buttons to the Ribbon and they run as required for me. However, when I share the file /ask colleagues to save it to the Startup folder, they are unable to see the custom ribbon tab. If they select the Developer tab, and then the Word Add-ins command, the file is listed under the 'Global templates and add-ins' section but the check box is unchecked. When they select the checkbox manually, the custom tab appears. I think the issue is to do with the ribbon not refreshing, if anyone can offer any tips I'd be really grateful.
I have this in my module

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Thanks