[O] GNU Emacs 24.3.1 creates macro-expansion failure messages

[Charles Cave]

I am running Org-mode version 7.9.4 and recently upgraded to Gnu Emacs 24.3.1.

Now when I start Emacs I get an error message which causes my Emacs to give 
the following message:

Eager macro-expansion failure: (error "Invalid agenda key") [2 times]
(lambda (x) ...) quoted with ' rather than with #'

Org-mode works but Emacs starts with a split window with a *scratch* buffer 
and a "GNU Emacs" buffer (which is the only window I expected).

My Lisp skills are almost non-existent. Who can help please?

Thank you
Charles