[phpOpenTracker-general] Can't get POT 1.5.0rc1 to work

I have the following configuration:
 * PHP 4.3.9
 * Apache 2.0.52
 * mysql 4.0.21
 * win xp sp2
 * pear 1.3.1
 * jpgraph 1.17

I installed POT via pear and changed the "phpOpenTracker.php" configuration
file with db name etc. I also changed the jpgraph path.
After that did I try to run this php script:
------------------------
<?
print ("bla<br>");

// prepend phpOpenTracker
include 'phpOpenTracker.php';

print ("bla2<br>");
// log access
phpOpenTracker::log();

print ("bla3<br>");
?>
------------------------

"bla\nbla2" show up fine but after that is everything halted. No more output
at all. I have tried to test various settings in POT but to no end. Any
suggestions on what to do? I suspect it might me some tweaking of php that's
needed, are any special parameter passing etc required by POT? PHP and
Apache are both configured with the default config's right now.

Any help is appreciated!
/Joakim Evers