phpinfo problem

I have just installed PHP-5.2.3 on my Kubuntu Feisty box. I removed all the debian php first and then compiled php with the options I needed. Now everything seems to be working except phpinfo.php which consists of one line. <? phpinfo(); ?> I get a blank screen. If I delete the php.ini file it get the usual phpinfo output. php -r "phpinfo();" works as does php -i and my php scripts run fine. What would cause phpinfo.php to not work? It's set rw for the apache2 user so I think the permissions are right. Is there a phpinfo enable/disable in the php.ini? Or in ./configure? Thanks. Rick Knight