Your .htaccess has some strange spacing issues that break the site when I replicate them on one of my codeigniter sites. I would try with these changes.
<IfModule mod_rewrite.c>
Options +FollowSymLinks
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ index.php?/$1 [L]
</IfModule>