Prefect htaccess in wordpress multisites

This is the .htaccess that a I have in my web (WordPress multisites 3.2.1)

# Use PHP5 Single php.ini as default
AddHandler application/x-httpd-php5s .php

# BEGIN WPSuperCache
# END WPSuperCache

# BEGIN WordPress
#<IfModule mod_rewrite.c>
#RewriteRule ^index\.php$ – [L]

# uploaded files
#RewriteRule ^files/(.+) wp-includes/ms-files.php?file=$1 [L]

#RewriteCond %{REQUEST_FILENAME} -f [OR]
#RewriteCond %{REQUEST_FILENAME} -d
#RewriteRule ^ – [L]
#RewriteRule . index.php [L]
#</IfModule>

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

# END WordPress

The first line was introduced by bluehost support, after problems with the upgrading to WordPress 3.2.1.

Basically, I can´t create a new site, admin users don´t have administration rigths (they can´t install new themes, or new plugins, or unnistall it). I create a new admin user, but same problem. Everything was fine before the upgrade 3.2.

¿Is the htaccess the problem? ¿Can somebody share the “prefect” .htaccess for a multisite, with 3.2.1, comming from almost 2 years of WordPress releases?

Thanks in advance.