Pages suddenly refuses to save documents, saying I don't have permission
After working properly, both Pages nor Word suddenly are refusing to save any documents to my hard drive, saying I don't have permission, which is nonsense as I'm the administrator of my new MacBook Air.
I've tried Finder > File ≥ Get Info only to find that, as administrator, I have read and write permission. I've tried re-granting myself permission, but it makes no difference.
Excel saves documents without any difficulty.
Help?