On a Mac 10.10.5, I just installed the update 1.4.4. Now, it just opens and I get the color "beachball". I can only Force Quit the app.
The Growl said "Configuration Error Proxy Could Not Find an Available TCP Port"
After I get the message, the beachball vanishes, but the OFF slider is OFF. If I try to slide it, the beachball starts and it freezes again.
It will be released soon.
In the meantime, we have a beta version available here with a fix: