Chaturbate is returning a bad gateway error - hense the prompt for credentials.
2019-01-07 20:14:09,070  INFO c3 [(null)] - ExtractionEngineDownloader: ERROR: Unable to download webpage: HTTP Error 502: Bad Gateway (caused by HTTPError());
2019-01-07 20:14:09,094  INFO c3 [(null)] - ExtractionEngineDownloader: Credentials required. Prompting.
Will look at a setting to turn this off for monitored urls, so it is non blocking for all others.
From CRS @ 10 Jan 2019 11:01