The other software print without a problem portrait/landscape. I have found an error when i launch the print preview the error is in relations at evince (No such file or directory). Perhaps this two problems they have the same cause?

I use inkscape 0.46 on slackware 12.1 i don't succeed to print my page in landscape (horizontal) but only in portrait (vertical). Before I don't have never problem. Why?
Excuse me for my bad bad english......