I have created a document with vertical as well as horizontal (ie landscape) master pages in ID CS5.
I created a master page then set it up with a page size of 11" X 8.5". This worked beautifully - until I went to print.
It printed my all of my pages vertically (portrait) even though the page size on one page was 11" X 8.5" The text and pictures just bled off of the right-hand side of my printed
page. Why did this happen? What do I need to do to get ID to print this page with a horizontal (landscape) orientation?
Rather than create a landscape and portrait master in the same file, I would have rotated the spread view, which changes the screen view, but not the actual page and would not interfere with printing. I'm a little surprised, in some ways, that you are the first user to post about this that I remember, and it seems like such an obvious problem that I would have thought it would be more common.
As a workaround, try exporting to PDF. The PDF is much more graceful at handling multiple sizes and orientations for printing -- set Acrobat to auto-rotate and center in the print dialog.