I'm on the free trail. i worked on my scrub and saved it but now it won't let me open it. it opens up as a blank page and on your website it says access denied.
The project you have uploaded to the cloud folder called math project seems to have become corrupted. It's likelt thats only the upload though and the local copy in your base folder will be fine for you to use and you can upload that again to overwrite the corrupted file.