Double check you are really logged in.  I used shift-tab to bring up the Impulse screen from the game splash screen.  The already filled out login name was my email address which didn't work.  I replaced with my forum login, and it worked.

For anyone else having this problem, I was able to get past the error by simply pressing 'esc' on my keyboard. It bypasses the screen and you get to play the game.

same problem

thanks for the 'esc' tip

It's strange, I'm logged into impulse, but the game says I'm not logged in.  I am starting from impulse.

All right, fixed it.  Shift-tab, used login, and changed my password.  I had changed my password since I bought elemental, I was logged into impulse using the new password but apparently you need to log into the game too.

Thanks for the shift-tab hint, I had no idea 

have the same problem on my PC - will try the esc-button when I get home - should get fixed otherwise nevertheless, of course...

Thanks, the ESC trick worked to play, but I can't get the multi-player to work