The drop-down was cut of at the bottom of the screen, but since it was exactly on the border to the next entry it looked like it just ended, and that there wasn't a spill over.  Decreasing the font-size of my browser revealed all the entries I missed (this was on Chrome).

Thanks for pointing out that this entry was supposed to show up.  I expected an entry there, but it never occurred to me that the drop-down extended beyond the visible browser area.  Bit of a usability issue there.  A better UI paradigm is to have scrollbars show up when there is spill-over.