When I type ‘RunPythonScript’ or ‘-RunPythonScript,’ I no longer get a file dialog box. Is this broken or am I missing something?
There is a new build of python that you need to install to work with the latest versions of Mac Rhino. This can be found at
http://www.rhino3d.com/download/IronPython/5.0/wip
Thanks for the solution, this fixed the problem.