yes. we have see this happend to us. we fixed the problem by taking off all
global parameters in npconfig.pub.(comment all lines with an #) If this is
not an option then you must add one line to the under the printer as an
option " pjl_supported = false"  otherwise the 3000 never gets
acknowledgement that the output was sent.
Some printer families are much different than others, especially anything
under the LJ4si. it is best to comment all globals parameters.

npconfig.pub.sys
   51     # global (setup_file = PCLLPD.HPENV.SYS)     # LaserJet 4Si setup
file
   52     #       message_interval = 60                # Repeat msgs every
>= 60
   53     #       banner_tray = 1                      # Upper tray has
colored
   55     #       data_tray = 4                        # Lower tray has
regular
   57     #       banner_trailer = FALSE               # Only need a header
page
   58     #       pjl_supported = TRUE                 # LJ4Si is a full
PJL device
   59     #       jam_recovery = TRUE)                 # Reprints jammed
pages

   62     900    (network_address =  xxx.xxx.59.161   #financial aid
   63                   setup_file = LJ3SISET.HPENV.SYS)
   64     910    (network_address =  xxx.xxx.60.23)   #purchasing
   65     920    (network_address =  xxx.xxx.58.40    #ais front office
   66                   setup_file = phil.HPENV.SYS)
   67     925    (network_address =  xxx.xxx.58.37)   #ais laser jet 5si
   68     930    (network_address =  xxx.xxx.58.41)   #lrc

also, if use are using an environment file, make sure you keep it
unnumbered otherwise you will get line numbers to appear in the top right
of the output.

much thanks to tony at the hp response center .