That's strange. You seem to have followed the instructions correctly, but it seems that the page just dies when the pal is loaded... I know I had problems on my home computer because of the flush() function not seeming to work on Apache 2+PHP. But that resulted in garbage showing, not stopping the page. You could try editing rdf.class.php and comment out the line that says flush() in the function finish() but that shouldn't be a problem really.
What newsfeeds are you using, could you possibly paste in the config part of your script?