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What to do if my user-defined ribbon does not show? (There is no error message) FAQ Link

For Access 2007: "Office Button" / "Access Options" / "Advanced" / "General" / "Show add-in user interface errors" needs to be checked.

For Access 2010 and Access 2013 use: "File" / "Options" / "Client Settings" / "General" / "Show add-in user interface errors"

 

With this option switched on all errors generated by Ribbon XML will be shown.

 

Erros in Ribbon XML Datei
(to enlarge click here)