Exported patch is black
When you want to view an exported cables patch locally you cannot just double click the downloaded
index.html file from the exported zip. What happens if you do so is that the file
index.html will be opened in your browser through the
file:// protocol, which you can verify by looking at the URL, which will look something like
file:///Users/you/Downloads/cables_your_patch/index.html. You will see nothing but a black screen.
The problem here is that the browser prevents the site from loading the patch data (from the
.json patch file). For this you need a local webserver. See Previewing an exported patch locally for local webserver recommendations.