Problem storing sessions

I'm having a problem getting PHP to store session information. The problem appeared after upgrading to 4.0.1pl2. The code works with the old daemon, and as far as I can tell there are no differences between the compiles of the two daemons. This is the code I'm using to test sessions: <? session_register("testvar"); echo "[" . $testvar . "]<br>"; $testvar = 100; ?> PHP is creating the session file in /tmp, however it never writes any values to the file. If I manually place "testvar|s:3:"300";" in the file it will display [300] but still does not write the new value for testvar to disk. phpinfo() shows that both register_globals and track_vars are enabled. FreeBSD 3.4-20000214-STABLE Apache 1.3.12 PHP 4.0.1pl2 './configure' '--with-apache=../apache_1.3.12' '--with-mysql=/usr/local/mysql' '--prefix=/httpd/apache' '--with-config-file-path=/httpd/apache/conf' '--with-xml' '--with-gd=/opt/src/gd1.2/' '--enable-track-vars' Suggestions are welcome. -- aaron / aig4.com