My friends, John and Michael, and I have compiled a guide/troubleshooting list for getting RViz (and other tools) working on OS X with the latest diamondback from SVN. I don't think there is any new information here, but rather a survey of the common problems encountered. The main idea is making ROS build as 32-bit only and using +universal macports everywhere, this comes from Dave's comment on this ticket: https://code.ros.org/trac/ros-pkg/ticket/4788#comment:8