Hi:
I have not observed that behavior (different number of rows per page) -- however, with PDF, the number of rows per page is dependent on several factors -- such as font size, cell padding, margins, papersize, orientation, style template being used, etc.
If you have a job that produces a certain number of rows per page in SAS 9.1.3 and you have that same -unchanged- job that produces a different number of rows per page in SAS 9.2, then you might want to open a track with Tech Support so they can help you determine how to get the same results as you got previously. It may be as simple as changing a style template, changing margins or changing cell padding.
cynthia