problem after installation.....can't logout and can't login

moscka

Hi,
I've installed Vanilla 2.1.8 on blue host, I create db, and I have installed vanilla in my wordpress 4.1 site www.sosinternet.it, after launch installation page (www.sosinternet.it/vanilla) I have this problem.

• from safari (browser that I use for installation) I can't logout from vanilla forum dashboard or discussion page
• from another browser (chrome or firefox) I can't login

I have try to change permission in xmlrpc.php
In wordpress I use this plugin :
akismet
broken link checker
cloudflare
comment reply by admins notifier
contact form 7
google analytics by yoast
jetpack by wordpress.com
quick adsense
rss icon widget
tinymce advanced
wordpress backup to dropbox
wordpress database backup
wordpress hit counter
wordpress seo
wp-polls
wp editor
wp smush.it
wp socializer
wp super cache
wp user avatar

thanks in advance
Luca