OWA New Message problem

We are running Exchange 2003 SP1, and use OWA on IE 6.1 as a primary client.

Recently, one of my clients, out of a clear blue sky, encountered a
problem - wherein when he creates a "new" message, he gets the new message
popup and can add an address either by typing or selecting, and can add a
subject, but the "message area" where you would normally type the message is
"grayed out" and shows the dreaded red "x" in the upper left corner, similar
to what you see if a picture cannot be "resolved".

Does anyone know what he might have inadvertently changed to do this ? Any
ideas ?

Thanks,


JM