Locomotive + RadRails Installation help.

Hi guys,
   Im having trouble getting RadRails and Locomotive to hook up! (Im
obviously on OSX hence Locomotive)

   Ive tried setting locomotive.app as a interpreter, but it doesnt seem
to accept it? Im defently having some problems getting it to work.

I've been told that if you open a Terminal for your application from
within Locomotive and then start RadRails from the command line, i.e.

open /path/to/RadRails.app

then things work.