Classic - Printer port (USB 1) disappears after switching User

I have used an Epson SP785EX on my iMac G5 under OSX 10.3 for months without trouble. I upgraded to OSX 10.4.8 and are constantly loosing this printer expecially when printing from Classic. After having tried everything including resetting the printing system it is still not clear what exactly causes the loss of the USB Port. However it may have to do with restarting or switching users. When in the chooser after selecting the original Epson Printer driver (which I have reinstalled many times) the Port (USB 1) does not show in the 'choose printer port list' (nothing at all shows). I have also tried the 'LaserWriter 8' solution which I do not understand. Perhaps someone can explain or point me to some literature. LaserWriter 8 shows in the Chooser but again nothing shows on the right pane of the Window. I am stabbing in the dark with this. Any help will be apprecated.
Thanks - Stefan
iMac G5 Mac OS X (10.4.8) Powerbook G4
iMac G5 Mac OS X (10.4.4) Powerbook G4

I have used an Epson SP785EX on my iMac G5 under OSX
10.3 for months without trouble. I upgraded to OSX
10.4.8 and are constantly loosing this printer
expecially when printing from Classic.
The printing subsystem changed considerably between Panther & Tiger. In Panther, you had to have a working OS 9 driver in order to print from Classic. This caused problems, particularly with certain HP printers which had OS 9 drivers which were not properly coded, and with newer printers which did not have and never would have OS 9 drivers.
In Tiger, things have changed. The default driver is the LaserWriter driver. You don't have to do anything, not even select the driver. The print system will print to the LaserWriter driver and the LaserWriter will print to the OS X driver for your printer. (This, of course, means that there must be an OS X driver for that printer...)
After having
tried everything including resetting the printing
system it is still not clear what exactly causes the
loss of the USB Port.
Classic does not have direct access to hardware, including USB ports.
However it may have to do with
restarting or switching users. When in the chooser
after selecting the original Epson Printer driver
(which I have reinstalled many times) the Port (USB
1) does not show in the 'choose printer port list'
(nothing at all shows).
This is normal.
I have also tried the
'LaserWriter 8' solution which I do not understand.
Just print, normally. The LW8 dialog box will pop up. You can then select the printer you want to use. (I have several printers on my system, two HP inkjets, a Brother laser, a label printer, a fax modem, and Adobe PDF)
1 type cmd-p or however you normally print
2 select the printer from the pull-down menu on the LW8 dialog
3 print
4 the system will hand off the print job to the proper OS X print queue, which will then print the file. If you're printing in color to a color printer, you'll get color output. If you're printing to Acrobat Distiller, you'll get a PDF. If you're faxing, you'll get the fax dialog so you can enter your dialing & cover sheet info.
Perhaps someone can explain or point me to some
literature. LaserWriter 8 shows in the Chooser but
again nothing shows on the right pane of the Window.
I am stabbing in the dark with this. Any help will be
apprecated.
Just print. That's all.
Thanks - Stefan
iMac G5
Mac OS X (10.4.8) Powerbook
G4
iMac G5
Mac OS X (10.4.4) Powerbook G4

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Classic - Printer port (USB 1) disappears after switching User

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