Hi Benjamin, From what you've explained in your mail, it seems that you're trying to use Boost.Logging from a DLL and an EXE as well. I need to know more details about your scenario. My suggestion: - defining the logs (BOOST_DEFINE_LOG) should happen in the DLL - declaring the logs (BOOST_DECLARE_LOG) should happen in both EXE and DLL - DO NOT define the logs in the EXEcutable as well Note that at this time if you do logging before initializing the logs, nothing will happen - I will fix this very soon. Note: there's some problem with your email address and I can't reply to you directly. Please fix it. Best, John -- http://John.Torjo.com -- C++ expert ... call me only if you want things done right