I just got an HP 2605dn Laserjet and was shocked when I used Acrobat 8 to print out a document. The entire areas within graphic frames were covered with red toner and making the other colors appear to be black and grayscale behind the red. This happened on 3 different documents. I am able to open the same PDF files in Apple's Preview and print them out correctly.

I would also like to add that in Acrobat 8, one of these documents was set up to be in Portrait mode for printing and instead it printed out in landscape mode. I went back and checked Page Setup after it printed and it was still set for Portrait mode. Apparently, Acrobat 8 is not ready for prime time.