We just tested Goldenseal with the public beta version of the next Mac OS (10.12 Sierra). Everything still runs as it should.
The only problem we found is that the blue-highlighted OK buttons in dialogs are hard to read. The ‘flat’ buttons in OS 10.10 and newer have a dark background that is designed for white text, but our code still draws the text in black.
Goldenseal Pro won’t have this problem, and it is far enough along that we probably won’t fix this appearance issue in the current Goldenseal app.
HINT: if you click on the colored button and then move the mouse cursor off the button temporarily, the blue turns to white so you can read the text.