Jenny, what happens when you try to save to the base folder or cloud? Do you get an error? Are those buttons just not activated?
If you want us to take a look you can attach a scribe here. Or if you want to keep your work private raise a ticket with our support desk and attach your scribe to that instead of a public forum.
This exact thing is happening to me. Yesterday it was fine. Today I can't save anything.
Thanks for all your suggestions. I finally rebooted my machine, and went back to the version that I had been working on yesterday. Lost about an hours worth of work, but am able to save now.