We've updated to v220.127.116.11 (from 18.104.22.168)and our users that authenticate via the SSO (Shibboleth)are redirected to wp-login.php to login instead of back to the actual site (ie, browse to mysite.com/site1 WP then redirects them to the SSO authentication but are then redirect to wp-login.php that require another login). Previous version wouldn't require this additional login.
Our network sites are set to 'Only allowed logged in users to see all sites' and we are using the Shibbolize plugin for SSO authentication.
Note: We have another network site setup identical to the one that is broken except that its running 22.214.171.124. I'll be downgrading the plugin to 126.96.36.199 from 188.8.131.52 until this is fixed.