Occasionally, you will crawl a website and obtain audit results which you do not understand. These diagnosis options are designed to help shed some light on the situation. By switching these on, you will be able to see the exact same data Sitebulb is seeing when it performs a crawl.
You can turn on these diagnosis options via the Advanced Settings.
To get to Advanced Settings, you scroll to the bottom of the main Audit setup page and hit the grey Advanced Settings button.
The Diagnosis section is under Crawler -> Diagnosis
In the screenshot above there are 2 options, however the 'Save Screenshots' option is only available if you are using the Chrome Crawler. If you are using the HTML Crawler, this option will not be visible on screen.