Version:            (using KDE KDE 3.4.0)
Installed from:    Unlisted Binary Package

KPDF always shows PDFs like this:

 __   __
|1 | |2 |
|__| |__|
 __   __
|3 | |4 |
|__| |__|
 __   __
|5 | |6 |
|__| |__|

Whereas on the same file Acrobat would show them like this:

      __
     |1 |
     |__|
 __   __
|2 | |3 |
|__| |__|
 __   __
|4 | |5 |
|__| |__|
 __ 
|6 |
|__|


For me, the Acrobat way makes more sense. Page 1 is the cover; when you open a book, the first page after the cover is usually on the left.

In KPDF, the subsequent 'left' pages are on the right and vice versa. For PDFs laid out especially for 2-page layout (in TeX, OpenOffice etc) this can look pretty strange.

If required, I can give an example file, but in my experience every PDF file created for two-page display shows these problems.