Hi! First, I'm on 1.44 and won't get around to test it on a newer version any time soon, so I'll just throw it in anyway: I've hit the case that when the executable running boost.test is calling BOOST_MESSAGE from a BOOST_GLOBAL_FIXTURE, the message is generated *before* the unit test runner is full initialized (the message "Running ## test cases..." is displayed *after* the Message). When writing xml output, this means that the `<Message>`is generated before the `<TestLog>` root, resulting in malformed xml. I can fix this quite easily on my side, since I've [customized my logger anyway][1], I'll just have to make sure unit_test_log_formatter::log_start is always called first for the xml case, but it's still a buggy thing imho. cheers, Martin [1] : http://stackoverflow.com/questions/26505229/how-to-log-boost-test-output-to-...