I am getting failures of the error.cpp regression test for asio that seem to be related to an order of initialization problem with the new boost::asio::error::system_category. It appears that asio::error::system_category is a const reference initialized by error::detail::get_system_category(), which simply returns boost::system::system_category. The problem seems to be that boost::system::system_category is itself a const reference to the actual system_category_const object created in Boost.System's error_code.cpp file. If it happens that the boost::asio::error::system_category reference is initialized before the boost::system::system_category reference, then boost::asio::error::system_category is a copy of the uninitialized boost::system::system_category reference rather than a reference to the system_category_const object. Attempting to use the category-related functions of an error_code created from the asio system_category enums then triggers an access violation. Of course, if boost::system::system_category is initialized first, then everything is fine. Hopefully that all made sense. Thanks, -Dave