PM+ V6 build 5376 on Windows 10
There seems to have been a recent change in the behaviour of various drop-down menus in the Metadata Template and the Metadata Info panel.  I'm not sure how many of the drop-down menus this comment applies to, but several.  I will describe the City field.  
In my case, when i click on the drop-down menu down arrow for the City field, I am presented with Add (or Remove) City, Edit Cities, a line and then 2 choices, both with submenu indicators.  (I assume that if I had more saved cities, then I would have more than 2 choices).  If I choose the first choice, then I get a submenu which consists of several of my recent choices for this field, a blank line and then the start of an alphabetical list of saved cities.  The problem arises in that the name of the parent menu is "The most recent chosen city - last alphabetical city on that submenu".  In my case, I could be presented with "Whitewater Region - Pembroke" as my first choice of submenu.  It is pretty counter intuitive that that is the correct submenu to choose when I am looking for "Chalk River".  In my view the submenus should be labeled only according to the saved cities.  Or perhaps better would be to present the recent choices as a separate submenu.