I appologize for being imprecise.
I opened Pages and selected iCloud in the open dialog box.
All of my documents are visible.
I selected a document to be opened.
A message appears "<Document>" couldn't be opened.
This is true for almost all of my documents.
I attempted to open the document on my iPad and got the same error.
I logged into www.icloud.com. I went to iWork and saw my documents.
I selected one for download and got three choices. PDF, Pages and Word.
None of them work. It says preparing to download for a bit and then it fails.