I'm finding that the cross-referencing and the go to references functionality is broken for C++ since 21.0
Given a class defined in a .h file, a .cpp with the declaration of methods, and references to the methods from other .cpp files then:
From the .h file, go to references on a method takes me to the declaration but none of the references in other .cpp files.
From the .cpp with the declaration, go to references finds nothing.
From other .cpp file referencing a method, go to references will take me to the declaration, but none of the other references.
This is in the context of a reasonable sized VisualStudio 2015 solution.