So I loaded Ivory on my Mac Pro just to see if the same thing happened cross-platform. However everything works in VEP on OS X (32 bit--no 64 bit OS X Ivory plugin available). The menu, however operates slightly differently. Instead of a seperate pop-up window like on Windows, it opens replacing or on top of (can't tell which but it isn't movable) the normal GUI.
Hope this helps. Hopefully we can get the windows bug figured out.