For those interested, I believe the blank canvas / black canvas is due to a change in macOS 10.14 and Tk needs to be updated:
https://stackoverflow.com/questions/52316783/nsscrollview-not-refreshing-its-document-view-in-mojave-osx-10-14 > I can confirm that it's an issue with Tk 8.5 built on macOS 10.14. This > will most like *not* be fixed as 8.5 is pretty old nor do I have any desire > to look into fixing it with a patch right now. > -- Dan Wilcox @danomatika danomatika.com robotcowboy.com
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