[libxml++] Stuck sax parse never returns

[Paul Robinson <rstocks_99 yahoo com>]

I am calling parse_memory on an XML++ sax parser and
passing it a std::string.  Sometimes it works and
sometimes it gets part way through the xml document
and then stops after an end_element call, never
completing the document.

My document is very short - only a single line of well
formed xml.

Any tips on what I might be doing to cause this?

Thanks!