I just posted a separate note on this. I can duplicate the problem with PPT
2007, either printing with acrobat distiller, or with microsoft PDF plugin
for Powerpoint 2007.
When pictures extend beyond the slide margin this can cause subsequent
slides to be blank. But I have trimmed pics to slide extent and I am still
seeing the problem. I haven't been able to isolate the slide yet, and they
are simple slides (1 pic on most slides, along with a line or two of notes).
Occasionally there is a title, but not on the slide where printing hiccups.