Description of Problem:
If I create a 2up ps file with

pstops "2:0L@.88(24.3cm,-1.6cm)+1L@.88(24.3cm,12.4cm)" file.ps > file2.ps

the corresponding output file2.ps will not print on a hp lj 4000 printer.
The sytem pretends it is printing the file but no pages come out of the
printer.
The are no errors on the console or in the logs indication what is going
wrong.
Printing one sided documents works fine. Viewing file2.ps with gohstview
works and printing file2.ps from a redhat 7.0 box also works.