Oh. Whoops. My mistake.
It's supposed to be:
http://www.utterlyinsane.org/fflag/print.php?storyid=
I'm using XAMPP 1.7.0 and I've had no problems with crashing (Windows XP). If you're using command-line, remember to uncomment php_curl and php_tidy from C:\xampp\php\php.ini. Apache uses a different PHP configuration file from the PHP command-line. If you don't have php_curl and php_tidy enabled, then the script's not going to work.
What operating system are you using? Can you give me the story id of stories that cause crashing?