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Hi there,

I also use OSx for simulation, but have never used the ep launch. What I usually do is to start the simulation from the command line. That is, you open the terminal (command line), go to the directory where your IDF is placed, and write

'runenergyplus name.IDF weather.epw'

Of course, replacing "weather" and "name" by valid files

Not sure if you need to add this script to the path (as Radiance and other tools require)

Hope it helps!