I work with a lot of tabs open and I tabbed and started typing and tried fix the url on an active design. I refreshed the page without the "/edit " path the browser returned a 404 and I went back to load the design from the design library and my design is now empty.
I tried search the forums to see if anyone else discovered the same thing. You can see for yourself by uploading a simple square and removing the edit part of the url. I am using Chrome on a mac.
Not a big deal since I have already printed my design. But I did not expect to loose my work.