We've been banging our heads against the wall since we upgraded to 3.3.1.
We have a medium sized network (30+ sites) and the login is no longer working on the subdomains.
However, we have several sites taht don't have a top level domain name assigned to them and are only subdomains on the network (subdomain1.ournetwork.com, sub2.ournetwork.com etc...). We cannot login on those sites at all. Everytime we go to sub2.ournetwork.com/wp-admin/ we get redirected back to the wp-login.php page (which let's say is normal behaviour) and then when we enter the correct login credentials we are back on wp-login.php??redirect_to=...%2Fwp-admin%2F&reauth=1
Any ideas ?