I have created a new version of a custom addin for SolidWorks. The addin adds a tab to the CommandManager which contains a bunch of buttons to macros. I have previously updated it without issue. However this time round I cannot make the Addin active in SolidWorks. When I go into the Addins list and tick the option to make the Addin active, close the Addins list and then reopen it the Addin is not ticked as an active Addins. I can tick and retain the Active at Startup option. The Addin appears in the Tools dropdown menu and I can expand it to show the list of macros, but they are all greyed out.