Scripts not working outside of Zend Studio

Hi All, I'm testing a session management script which seems to work fine in the Zend Studio debugger. However, when I load the script directly into a browser (http://localhost/my_test.php), it displays a blank screen and the only code in the browser's view source is <html><body></body></html>. I can right click the "Debug Output" in Zend Studio and select "Show In Browser" and it loads the page into the browser and displays correctly. I've got the php.ini set to throw errors: error_reporting = E_ALL & E_NOTICE & E_STRICT display_errors = On I've tried this in IE and Firefox and the page won't display or throw an error in either one. What could be going on here? I've been chasing this for hours. Thanks for any help, Steve