.htaccess stopping safecracker from doing its thing on home page

I am having an issue where the htaccess seems to be messing up the safecraker from, when i press submit the page just refreshes and the content is not added to EE.

Here is the htaccess code (I put the system in sub dir /dev/alo001/):

<IfModule mod_rewrite.c>
RewriteEngine on
        # Removes index.php
        RewriteCond $1 !\.(gif|jpe?g|png)$ [NC]
        RewriteCond %{REQUEST_FILENAME} !-f
        RewriteCond %{REQUEST_FILENAME} !-d
        RewriteRule ^(.*)$ /dev/alo001/index.php/$1 [L]

        # If 404s, "No Input File" or every URL returns the same thing
        # make it /index.php?/$1 above (add the question mark)

</IfModule>

more info: Admin > General Configuration is the field for “Name of your site’s index page” is empty

the site groub template is the home page group the odd thing that when I go to the home page http://mydomain.com/dev/alo001/ the form the page just refreshes and the content is not added to EE. but if I go to http://mydomain.com/dev/alo001/site/ it’s work fine!!!!!!!!!!!

I hope this will be clear.

Thank’s, Ahmad