Hi, I have an experience of debugging stream_error problem. It appeared that I was saving pointer and loading reference. I suggest such a mistake is common enough to be documented at http://www.boost.org/libs/serialization/doc/exceptions.html#stream_error WBR Oleg V. Zhylin ovz@yahoo.com ____________________________________________________________________________________ Never miss an email again! Yahoo! Toolbar alerts you the instant new Mail arrives. http://tools.search.yahoo.com/toolbar/features/mail/