There seems to be a bug in the script on the new login page. If you try to login using an SE account, keyboard shortcuts can prevent you from entering certain characters into the field. I'm noticing the issue on Firefox.

###Repro
 1. Got to the [login page][1]
 2. Open the "Log in using Stack Exchange" panel
 3. Put focus into the field and try to type in <kbd>g</kbd>, <kbd>h</kbd>, or <kbd>s</kbd>

###Results
<kbd>h</kbd> does nothing, <kbd>g</kbd> does nothing on it's own, <kbd>g</kbd>+<kbd>h</kbd> goes back one page, and <kbd>s</kbd> gives focus to the search field. <kbd>?</kbd> also shows the help commands, even when focus is in the field.

###Workaround
The only workaround I've found is to disable the script, reload the page, and then renable it after being logged in.

  [1]: https://stackoverflow.com/users/login