A truly great plugin - when it works. With this version and prior versions I was suddenly experiencing two major show stopping problems:
(1) I was unable to reach the network admin and frequently other blogs in the control panel.
(2) My password was not being accepted for login in the admin.
(3) The links on wp-admin wouldn't work. The "recover password" wouldn't go anywhere. Going to the 'login' link it would redirect to the home page.
I can't explain these problems but see a few others have some as well.