I installed foundation 6.4 with the Zurb template. I took the index.html file that comes with the installation and copied the top-bar from the docs to the beginning of the file. That worked fine with a drop-down menu on the left and a search bar on the right. Then I reversed the two. This didn't work properly. The drop-down menu stayed on the left followed by the search bar. I haven't been able to get a drop-down menu in the right part of the bar.
Another alignment problem I found was with the media object. I couldn't get a media-object-section to align on the middle or the bottom.