If you have a vertical multi-monitor setup and the launcher is on a top screen you cannot move it down to a bottom screen.
I'm pretty sure this is caused by some extra code added to prevent the window from going too far off screen, but there is a reason it isn't the default behavior for Windows. You can't move it down to any screen below.

Here is a screen shot of the issue.
http://imgur.com/gallery/HtTkLQm