Originally Posted by t-mug
The same for me. Except I enable the "show validation bar" of the web developer plugin (in german it is: Extras => "Seitenvalidierungsleiste anzeigen"). Instantly the admin login is not possible any more and I get "login.php?err=" in the address bar. Please try it out.
It should work on other computers. I've tried it from my laptop and it still don't work.