If anybody tries this and finds it works can you please feed back here.

Step one delete your cookies

Step two using Google Chrome see if you can log in

Step three assumes step two works -- does it remember you when you log in again.

I totally agree with Ken that this is our problem and I expect it to get it fixed but as a workaround the above fixed it for me. If it fixes it for you can you post to this thread please and tell us.