Is there any reason why Godot might not be able to open (I'm on Mac OS Sierra)? I'm installed Mono SDK, the latest version and the recommended version but to no effect.
Why is Godot Not Opening Up on macOS?
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Have you tried right-clicking the Godot application, choosing Open then clicking Open anyway? You should also try the non-Mono version of Godot, just in case.
The non-Mono version works fine and It may actually do for me because I'll initially just be working with GDscript, I'd just like the option of using C# once I'm better with it.
Can you open it in a terminal (or whatever the equivalent for MacOS is) and see if there is a error message?
My hunch is something is not configured correctly, especially since the non Mono version works. Hopefully the terminal (or equivalent) will help shed some light on what could be the problem.