Admin login widget not refresh (loop)

Hi,i’ve encountered a loop refresh when i try to login from the sidebar widget.
I saw that with the plugin jetpack, jetpack only for admins and sidebar login (both 2.40 2.50)

I tryied a lot of theme, but the problem still persist.
More info from this thread, where i discussed with someone of jetpack author.

http://wordpress.org/support/topic/breaks-sidebar-login-plugin?replies=10
Wordpress version 3.5.1

http://wordpress.org/extend/plugins/sidebar-login/