I've tried a number of examples of both the prosper and the seminar style on the debian woody distibution. I think the problem has to do with page rotations, somehow.
With prosper: I cannot create a pdf with dvipdfm, the image is just white with tkdvi or xgdvi. I can use a2ps and I get a postcript where the bounding box is off ,the image is upside down, and all of the nice tone changes that are supposed to be in the slide background are rendered as broad colored streaks. The only error I with a2ps is ignoring special PS operator "SDict" With seminar I've made some progress. tkdvi shows the first page ok, but the framing is wrong and as soon as I move to another page everything is jumbled up, even when I move back to the first. xgdvi shows the text, although the framing is messed up, as is the page centering. Fortunately, dvipdfm works fine and I can create pdf slides. LaTex will not make a dvi if I try to convert pages to portrait form....it just works with landscape for me. So I guess I'll go with landscape seminar pdfs. I am curious why all of the others don't work, since I have not had problems with "article" class documents before. Any suggestions would be greatly appreciated. Thanks, Glen