I’m sorry, but what I described earlier was based on launching the Simulator directly, and I’m not familiar with ZeroBrane, so I shouldn’t be able to help you.
Like @clang, I’m also not familiar with ZeroBrane, but you can take it from me, directly launching the simulator won’t have a big impact on your workflow once you get used to it. 
Hopefully this is the rood cause of the problem, and you can get back to carefree developing!
To all, final resolution was as simple as opening Corona Simulator from the Finder. I have no idea how to make the >> button in Zero Brane work as it has for years.