Last modified: 2014-01-10 15:54:13 UTC
Steps to reproduce: - go to any page at http://en.wikipedia.beta.wmflabs.org/ - edit the page with visual editor - popup appears with text: Error loading data from server: internal_api_error_ErrorPageError: Exception Caught: The content format json is not supported by the content model wikitext.. Would you like to retry?
*** This bug has been marked as a duplicate of bug 59867 ***