The filesystem path streaming operator (>>) has a bug, documented here: https://svn.boost.org/trac/boost/ticket/4716 A patch was provided, and was implemented on the trunk, detailed here: http://lists.boost.org/boost-commit/2010/08/27576.php The fix was not merged to the Release branch, so missed the 1.45 release. Please can this be merged, so it gets into the 1.46 release? [.../boost/io/detail/quoted_manip.hpp]