Trouble with landscape page orientation

I am using Excel 2007 and suddenly cannot change the orientation of spreadsheets to landscape. When I click on th epage setup orientation it shows that my spreadsheet is landscape but when I view in print preview or print it is portrait. I've opened several spreadsheets that were landscape before and they too are now showing up in a portriat orientation. Help!

This must have been "user error". I re-opened the troublesome sheet and it is now OK. Thanks.