Default Index file is not loading

Hi All, I have just started my instance and have a basic problem. The default index.php is not loading in one of my directory - unless I put a backslash manually. The directory is - http://4brownbag.com/lamp

The htaccess file in the directory says the following

DirectoryIndex index.php index.html
ErrorDocument 404 "[404 error] If you're seeing this error after install, check$

Options +FollowSymLinks
Options -Multiviews

RewriteEngine On
RewriteCond %{SCRIPT_FILENAME} !-d
RewriteCond %{SCRIPT_FILENAME} !-f
RewriteRule ^([a-zA-Z0-9-]+)$ $1.php [L]

I have gone through various articles to resolve and yet got nothing. Will appreciate any solution to this as the issue is exposing the installation terribly.