I have been using SD for Mac on my iMAC running latest Yosemite with all current upgrades for about 3 months.
Mostly it runs ok, but I have had some odd chart effects, such as absence of terrain despite this being ticked as desired and a patchwork background rather than single colour base.
Most recent issue is that I either get French charts but not English or vice a versa if I reboot, the missing data just results in a more or less blank outline of the country concerned. This has not happened before. The charts are ticked as being present on the chart update dialogue box, but when I try a chart update, I get an error and need to close message, as though I was still using Microsoft windows. I do have parallels installed on my iMac, but do not have it launched when using SD.
Thanks for all your work on the Mac "version", I would be grateful if you could tell me what I might do. (My mini iPad with SD works perfectly by the way)!