Try to load and then relaod this page:

----
<?php
session_start(); session_register("myobj");

class myclass {
  var $slot = 1;
}

if ( !isset($myobj)) {
  $myobj = new myclass();
  $myobj->slot=4;
}

?>
<html>
 <head>
 </head>
 <body>
  <%=++$myobj->slot%>
 </body>
</html>
----

it should produce "5" on the first load (and does this) and
"6" on the second load, which it doesnt.

Instead i get on my apache 1.3.6

----
Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, boris@erdmann.com and inform them of the time the error occurred, and
anything you might have done that may have caused the error.

More information about this error may be available in the server error log.
----

Boris