Can't import images in building editor

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In Gazebo 5's building editor, I'm trying to import a floorplan, saved as a 1000x1000 pixel .png. When I click import, I'm given the bar to type the file path and name, and the cancel and next buttons below. When I type the file location, name, or nothing at all and press enter (or click on the '...' box next to the bar), the file browser opens. However, nothing appears in the window. Sometimes there's the places bar on the left side, but I can't click on any of the options. I can highlight 'File System', but nothing appears in the box. Has anyone else experienced this issue? Thanks!