Hello Boost Users, OS: Windows XP Compiler: VS 2005, 8.0.50727.42 Boost: 1.33, cvs Attachments: screen shot of assertion failure I have a problem with description formatting. It's not possible to make longer description. How long the description must be depends on other descriptions. So adding a description longer than some size invokes assertion in xstring file in the Visual Studio distribution. I tested this issue also with example "options_description.cpp". I changed description at --help switch from ("help", "produce help message") //that is working for me to the description on http://www.boost.org/doc/html/program_options/overview.html#id2714805 ("help", " A long help msg a long help msg a long help msg a long help msg a long help msg a long help msg a long help msg a long help msg ") //that failes