Migrating legacy code - changing session name

Hello List A client has asked me to migrate a few scripts that have been running merrily under PHP4 to PHP5.2. Part of these scripts have integration with PHPMyAdmin using the single sign-on and so they make use of the following code : session_write_close(); session_name("blah"); session_start(); Now, assuming that prior to session_write_close(), I have a session that (amongst other elements) contains the following: $_SESSION['a'] = (an instance of Object A) $_SESSION['b'] = (an instance of Object B) $_SESSION['c'] = (an instance of Object C) After session_start(), I have the following : $_SESSION['a'] = (an instance of Object C) $_SESSION['b'] = (an instance of Object C) $_SESSION['c'] = (an instance of Object C) This does not consistently happen, only under particular circumstances (it seems to be a certain set of elements in $_SESSION triggers it). For instance, if I unset $_SESSION['b'] * prior* to doing session_write_close() - the behaviour stops, and the elements are retained. Has anybody seen this before? Vital Stats: PHP5.2 Apache1.3 FastCGI Sessions are stored using PHP5's default session handling. Thanks in advance