My .htaccess file looks like this:
Code:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . index.php [L]
</IfModule>
# Prevent file browsing
Options -Indexes
Let me know what happens if you replace your .htaccess file with this one (after making a back-up of your own version).