The new vertical login form moves the header contents (if any) out of the form. This means that the captcha that appears (by default after three bad login attempts) doesn't work!
To reproduce, visit http://www.mediawiki.org/w/index.php?title=Special:UserLogin&useNew=1 and enter a bad password.
Version: 1.22.0
Severity: normal
URL: http://www.mediawiki.org/w/index.php?title=Special:UserLogin&useNew=1