If I invoke a Find References for a an overridden virtual function in a derived class, the results window does not display any references to the base class's function. Therefore I can't see where it is called, as it is called virtually from the base class in this case.
A workaround for this problem is to do a find references on the method declaration in the base class. Of course, this in turn doesn't show the calls that are invoked on the derived classes.
Rename in a base class changes overriding names in derived classes. Rename of a overriding member in a derived class does not rename within a base class.