Can't change keyboard layout

[sebastianrasor]

I use Dvorak, and having to figure out how to type QWERTY again every time I want to log in to a new session is a pain. When I click the "Keyboard Layouts" button, a very thin bar appears with no content. I assume this means that the list of available keyboard layouts is empty. When I try to click the same button after locking an existing session, nothing at all happens.