This is what I see when I go to login.
I'm pretty sure that my Pulse is quite old, but when I set it up I was told to stick to the older version unless I needed to use the pulse front end design templates in which case I should then upgrade. But like I say that was a while ago.
Ah because of your posts I tried to login using Chrome and I don't get the same message, it logs me in as usual with no problems. So what does that tell us?