Stuart, Ironically, Acrobat has never had any "black and white display mode." Congratulations, you've invented a new feature for an old product.
However, Acrobat does have an "accessibility" display feature (although I don't recall how many versions back that went - Acrobat 6 is over 5 years old now - current version is Acrobat 9). CTRL-K and then go for the accessibility pane or if there isn't one, wander through the various preferences to see if you somehow toggled the accessibility display feature on. This feature allows customization of Acrobat's display screen for users with vision problems and one or more of those modes could be monochromatic. Let us know if that was it. - Dov > -----Original Message----- > From: Stuart Rogers > Sent: Monday, September 15, 2008 8:07 AM > > Win XP SP2 > Acrobat Pro 6.0 > Dell Precision 360, Pentium 4, 3 GHz, 1.5 GB RAM, 14GB free disk space > on C: drive > > All of a sudden my Acrobat Pro 6 has lost the ability to display colour. > All PDFs I open, whether created on my PC or downloaded from other > sources (and known to be colour documents), display in black and white > only. Printing these docs from Acrobat works fine -- colour as expected. > > Cold or warm reboot does not help. > > Have I accidentally hit a keyboard shortcut that turned off colour? Any > other ideas? I looked through all the Preferences, but I don't see > anything that looks likely. Other than that, I don't know where to > start :-( > > Thanks for any suggestions... > > -- > Stuart Rogers