Boost.format bind_arg with an empty string is not working for Boost 1.33.1 (it used to work in 1.32).
The offending code is this one:

    format f("%s%-.32s:%|40t|%|.6|%|54t|%25s\n");
    f.bind_arg(1,"");


It crashes because of a null pointer in a buffer (buf_).