What causes areas to be grayed out when viewing in Acrobat 9?

What causes text to be grayed out when viewing in Acrobat 9?
Douments which were fine in Acrobat 9 suddenly have areas blacked or grayed out.  The same thing happens if opened in Acrobet Reader.  Is there a setting that causes this.
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It could be that the text is an image.
Try going to Edit>Preferences>Page display>Page content and information and check the box hat says "Display large images".