I've got the new subgraph.hpp and many of the template errors have gone away. However, I'm still getting several errors relating to this bit of code:

//===========================================================================
 // Mutability Traits
 // Just pull the mutability traits form the underlying graph. Note that this
 // will probably fail (badly) for labeled graphs.
 template <typename G>
 struct graph_mutability_traits< subgraph<G> > {
     typedef typename graph_mutability_traits<G>::category category;
 };

In particular:

subgraph.hpp(893) : error C2143: syntax error : missing ';' before '<'
subgraph.hpp(893) : error C2059: syntax error : '<'
subgraph.hpp(893) : error C2065: 'G' : undeclared identifier
subgraph.hpp(893) : error C2143: syntax error : missing ';' before '{'
subgraph.hpp(893) : error C2447: '{' : missing function header (old-style formal list?)