Gray scale instead of text

Some PDFs seem to show unreadable text in iBooks. They open okay in Adobe Reader, but in iBooks they just show gray scale gradients instead of text. Images display fine.
One other forum suggested that this is a problem caused by PDFs created in Word 2007.
Is this a known issues and if so, what questions should I ask Apple (and other app developers), so that they can fix this?

Since this is the Adobe Reader forum, this is not the right place to ask about a problem/limitation in Apple iBooks.
Here are two Apple forums where you might ask:
iBooks
Creating Books for iBookstore

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