Thanks to you both, but I've completely shut down in the past - even not used the reader for several days - and it didn't help.
Medard suggested in a private email that it might be due to a poorly formed epub that the reader couldn't cope with. So I deleted some suspicious ebooks, and without shutting down did a note on an ebook I know validates, and closed the ebook. I then opened the ebook, and could read the note. I then did a book mark, closed the ebook, re opened it, and could find the bookmark with Notes.
So now I can use Notes on my T2 to proof read the ebooks I design. Thanks again, Medard.
If I get the problem again I may validate every ebook before I load it on to my T2.
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