There has been on OSX Mavericks specific issue reported so far, which is that the MoI window disappears if you try to drag it on to a second monitor.

This appears to be this XQuartz bug here: https://xquartz.macosforge.org/trac/ticket/796 and it looks like it will maybe get fixed in an OS update later, or maybe an OS update + new version of XQuartz.

- Michael