My browser / operating system: ChromeOS 13904.41.0, Chrome 91.0.4472.81, No Flash version detected
All my backdrops from yesterday and today just completely disappeared. I went to another website but kept scratch open. When I came back, the backdrops had disappeared. This is a big problem, because those were part of a movie.

Also, there were some really complicated ones, so now I have to completely remake them.