Building Editor in Gazebo 4.1 doesn't offer floorplan import

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Hi all,

I am trying to model a complex floorplan of a very large indoor environment. I have accurate floorplan models, and would like to import them into the building editor in order to accurately place walls and such. Unfortunately, the Import button doesn't show up at all for me in Gazebo. I've installed packages from osrf, ros packages, and done a compile from source, and none of those options have solved the problem. What am I missing here?