I am getting ambiguity errors on Metrowerks 9.2 when using Boost.Function and Boost.Signal. These errors can be corrected with the following patches: <boost/function/function_template.hpp> (470) - if (!detail::function::has_empty_target(addressof(f))) { + if (!detail::function::has_empty_target(boost::addressof(f))) { <boost/signals/trackable.hpp> (105) - add_if_trackable(addressof(t)); + add_if_trackable(boost::addressof(t)); Regards, Reece