When I try to login with my Twitter account, I see a pop up screen with the following message:
There is no request token for this page. That's the special key we need from applications asking to use your Twitter account. Please go back to the site or application that sent you here and try again; it was probably just a mistake.
As I see, there is no oauth_token data which I see is available on WPMU website.
I have entered Consumer key and Consumer Secret keys and checked twice that it is the same as on Twitter page.
The problem is also with Google login, when I press the key I get myself to the GMail settings page, without any choice to allow access to my URL.
Thanks in advance!