By Dennis Collin
Question:
How do I reset the Revit ribbon menu and/or the Quick Access toolbar?
Answer:
If you need to reset the ribbon to restore default settings, you can delete the UIState.dat file which holds Revit's interface settings.
UIState.dat is located within the following folder:
%APPDATA%\Autodesk\Revit\Autodesk Revit 20??\<language>
or for Revit LT,
%APPDATA%\Autodesk\Revit\Autodesk Revit LT 20??\<language>