session problem

Hi all, I'm having the following problem. I have PHP-4.0.5 staticaly compiled with apache 1.3.19, running on a red hat linux with a 2.2.12 Kernel. The following script does not work the second time called, the browser just "hangs" and returns a "this document is empty" after a while. I am getting no error message in the log files and the session files are being created in the tmp directory, they are empty though. <? session_name( "test" ); session_start(); $session_ok = session_register( "counter" ); if( $session_ok ){ echo( "Counter: ".++$counter ); }else echo( "failed" ); ?> Any ideas? How can I get some kind of hint as to what is going wrong? thanks, Robert