500 Internal Server Error on new site Dashboard after 3.6 upgrade

The topic title says it all, but this has more details:

• I upgraded from 3.52 to 3.6
• The main site leonardoflores.net works fine.
• I tried to create a new blog http://leonardoflores.net/3211/ but it doesn’t seem to have a theme working.
• I get a 500 Internal Server Error when I try to reach the Dashboard

I don’t know if this is useful, but here’s the htaccess file information:

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

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ – [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) home/$2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ home/$2 [L]
RewriteRule . index.php [L]
</IfModule>

# END WordPress

# BEGIN wtwp_cache
# END wtwp_cache

# BEGIN wtwp_security
# END wtwp_security

Help!

on new site Dashboard after 3.6 upgrade