"The Maqetta application is currently at preview level. By engaging with the community with Maqetta at an early stage, IBM hopes to collaborate both on product requirements and on open source development, with the goal that future releases of Maqetta will deliver strong tools for UI design and an efficient workflow between UI design and production development."
I couldn't tell it worked at all. Dragging and dropping objects from the palette had no effect, nor can you draw them on if selected. You might think you need a "pane" but those don't work, either. This was in Chrome. A friend had the same result in firefox. I can't even get maquetta.org to open in IE9, but that may be stupid McAfee Web Gateway/Barrier. Why on earth would they "preview" an app that doesn't work at all?