Odd one! I get the messge "Could not find color space named 'Cs6! Usually such messages can be ignored because they refer to some introductory figure or art work. I get the same problem with Internet Explorer.
This is followed by "...file contains information not understood by the viewer. Suppress further errors?" This often happens when the language is difficult. Usually I just say no and go right ahead, without problems. The Acrobat reader just shows black pages. The formatted text, as I said, is fine.
Any suggestions?