Just in case…
I wasn’t able to use easel until I found a small bug.
I’m currently using an OS X Yosemite with a case sensitive file system.
After looking on Easel Logs “/Library/Easel/iris.error.log”, there were an issue with a referenced path:
/Library/Easel/iris/ was not found.
I’ve just make a symbolic link to /Library/Easel/Iris : “ln -s /Library/Easel/Iris /Library/Easel/iris”
All seems to be fine now.