If, at any moment, you click "Unpublish" for a tour in TourBuilder, you may see a result of Google replacing the thumbnails with grey boxes. These are temporary placeholders for your thumbnails as Google works to take down the tour. It takes some time for Google’s servers to remove scenes. The grey boxes are only temporary.
Please watch our instructional video on why this happens:
This is also why we do not recommend you to click "Unpublish" to republish a tour if you are attempting to have it appear on Google. If you are experiencing a prolonged publish time, please only click "Publish" to send your tour and connection info back to Google.