posterazor 1.4 works fine on a4 size paper in portrait mode. but when the paper is set the landscape, the generated pdf is wrong. if you have, say, a 5x5 page grid, the generated pdf will wrong... the first 5 pages will be the TOP of the image, the next 5 pages will be the BOTTOM on the image, and the remaining 15 pages will be blank.
i can post examples if need be. - about 5 megs total file size though, so will only do it if asked.