Document Properties Grayed Out

One of the fields on a document is invisible when it shouldn’t be. When I look at the document properties from a view, all the field listings show along with their values including the one that is invisible, however, everything is greyed out. Any idea what would be causing this? I have a reader field on the document but I’m listed with full access.

Subject: Document Properties Grayed Out

$KeepPrivate

regards,

raphael