FYI When producing a small, but mildly complicated booklet, small artifacts appeared on the printed output. The artifacts were small hourglasses about the size of one character. The initial pages of output were okay. The artifacts increased towards the end, maybe 50 or so on the final (lower right) panel of the last page. This was a 40 page booklet being printed as 10 pages using 2 rows and 2 columns, all in landscape. The most distinguishing thing about this project (and likely precipitating this problem) was that the pages (panels) were being printed completely out of order, eg. 40,1,38,3 then 32,39,4,37 then 36,5,34,7 then 6,35,8,33 etc. (I did this so I could generated a small booklet cut to 8-1/2 x 5-1/2).
Great program by the way.