I saw this post (http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?query=print+Landscape&dg=microsoft.public.sqlserver.reportingsvcs&cat=en_US_96ea9d50-8249-45f3-8433-e50dd796681f&lang=en&cr=US&pt=&catlist=&dglist=&ptlist=&exp=&sloc=en-us) and although it's a couple of years old I wonder if that might still be the cause of your problems. Unless Microsoft have actually addressed it with a hotfix or similar.