I’ve created an up-to-date version of SkyDemon to run on Mac OS X.
This is something I’ve done for my own benefit and happy to share, but isn’t supported by SkyDemon.

You can download it from here: https://www.dropbox.com/s/h7hwsbz0i1nfndn/SkyDemon%20for%20Mac%203.6.1.13.zip?dl=0 
Download this, uncompress it, then copy it to your Applications folder.
If you've already got an earlier version installed, first drag it from Applications folder to the Trash - you shouldn't lose any settings when doing this, as these are stored separately in your Documents folder.

Important: The first time you run it, you will need to locate it in the Applications folder from Finder and press the Control key, then click the app icon, then choose Open from the shortcut menu (this is because it is 'untrusted' - see: https://support.apple.com/kb/PH18657?locale=en_US ).  You may also have to click “Allow” to a pop-up about accepting inbound connections.

Please use this thread for any specific feedback / issues with this build (good or bad) - keep complaints about lack of native version elsewhere. I can’t promise to fix everything - and indeed one day this might all suddenly stop working when some unwanted update comes along. At the risk of sounding like a lawyer, use entirely at your own risk.

Known issues:
As with the previous versions for Mac, there are three known unresolved issues:
 - you must have a printer installed and configured before using Print Centre, otherwise Print Centre won't work;
 - the weather icons in the weather panel are not displayed;
 
How does it work?:
This uses a technology for wrapping Windows apps to run on OS X called Wineskin (currently v2.6.1, using engine WS9Wine1.7.52), and should run on Mac OS X 10.6 and above including El Capitan. It wraps SkyDemon (currently v3.6.0.12) for Windows.

 

John, 
I've seen this behaviour before - albeit never managed to get conclusively to the cause.
In my case manually resizing the window (i.e. pressing the green maximise button and dragging the bottom right of the window) seemed to resolve the issue - I needed to drag it to be smaller than the shown area, and then drag it larger)

It seems to be a bug in the wrapper somewhere.
Let me know if that works - if not - there is a slightly more complex resolution
Richard

The current version appears to have a problem with language coding (again?).

When I start the Wine-wrapped version I get i.e.:

with correct display of names (see Röbel/Müritz).

The moment I move the map or do anything, the denominators switch to:
.

Hm?

BTW: how to I request SD updates in the Wine-wrapped version?
*update* ok, workaround is to log out and in again.

....however, running it on a standard Macbook Pro I appear to be getting display problems and can't work out how to expand the display .....