I upgraded from CS4 to CS5 several months ago. Since then, the "Guard Page Filename" has been blank and I have not been able to set it. As my screen shot shows, no guard page is found. And I'm not able to enter one. It rejects "index.php" (my primary index page for a directory) and "index.html" (my secondary index page for a directory). What's up? What are the consequences of this field being left blank?