- Is it possible that some parts of your code are compiled without BOOST_HAS_THREADS? I updated user.hpp and then executed: % bjam clean % bjam install

I assume that is sufficient to recompile all of the boost code?

- Is it possible that you are assigning to the shared_ptr<Connector> object and at the same time reading it (making a copy of it, for example) or even assigning or resetting it from a different thread? It might be a possibility; I'll sift through the code to see if I can find any situations like this.

Thanks!