When I'm visiting Google Groups, Google shows me only that page.

http://groups.google.com/groups/update_account?_done=/

If I click on leave address, nothing happens. If I change the address nothing happens, too.

http://img371.imageshack.us/img371/584/problemgroupsvf4.png

someone the same problem?

I use Google Groups everyday, no problem for me.

It is a known issue: http://groups.google.com/group/Is-Something-Broken/browse_thread/thread/44742c6efe57a090

I use it everyday as well. My only problem lately is the neverending Spam.