Stragne ... it does not require xinerama though I believe it does support it. Maybe the postscript was wrong; it just uses the ghostscript rendering engine so if it looks OK with other postscript viewers it should be OK with pspresent.
Yes, I think the postscript may have been bad cos I converted a pdflatex generated presentation made using pdfscreen from pdf to ps.. I tried a regular ps file and it worked...
Thanks, nirmal