Posted almost 3 years ago. Oct 02, 2016 - 18:41 UTC
nbviewer is having issues due to upstream problems in the @GitHub API service. There doesn't appear to be anything we can do but wait for GitHub to recover. It should continue to work to post notebooks to static URLs to bypass the GitHub API in the meantime.
Posted almost 3 years ago. Oct 02, 2016 - 17:22 UTC