I'm moving your question to the Acrobat forum, since it doesn't relate to our CreatePDF service.
Ok, I have a little more information, but still no solution. It appears that certain PDFs will print with the proper orientation, while others do not. A file originally created in Acrobat 8 printed with my original Acrobat 8 settings in Acrobat X and produced a proper landscape orientation. However, a document produced in Acrobat 5 with the same settings printed in Acrobat X still rotated 90 degrees. Are there any differences in the settings of files created in these two different versions that could cause this change?