I am trying to get an Epson WF-2540 networked printer working with my SL 6.6 
installation. I have downloaded the requisite driver package 

epson-inkjet-printer-201211w-1.0.0-1lsb3.2.x86_64.rpm

from Epson and it installed without problem. The printer was installed using 
system-config-printer and is recognized by the system as the only/default 
printer. Among other things the ink levels are reported as expected for the 
printer.
    However, when I try to print a test page it fails and the state reported 
by CUPS is


stopped 
"/opt/epson-inkjet-printer-201211w/cups/lib/filter/epson_inkjet_printer_filter
failed"

Attempts to print from LibreOffice and emacs also fail.

Running system-config-printer, selecting the printer, and trying to print a
test page shows the following.

# system-config-printer
/usr/share/system-config-printer/system-config-printer.py:2733: GtkWarning:
Failed to set text from markup due to error parsing markup: Error on line 1:
Entity did not end with a semicolon; most likely you used an ampersand
character without intending to start an entity - escape ampersand as &
  frame.get_label_widget().set_use_markup(True)
/usr/share/system-config-printer/system-config-printer.py:2735: GtkWarning:
Failed to set text from markup due to error parsing markup: Error on line 1:
Entity did not end with a semicolon; most likely you used an ampersand
character without intending to start an entity - escape ampersand as &
  self.vbPOptions.pack_start (frame, False, False, 0)
/usr/share/system-config-printer/system-config-printer.py:988: GtkWarning:
Failed to set text from markup due to error parsing markup: Error on line 1:
Entity did not end with a semicolon; most likely you used an ampersand
character without intending to start an entity - escape ampersand as &
  self.PrinterPropertiesDialog.show ()

Can anyone suggest what I should do next?

For comparison I installed the printer on an SL 7.1 system and have no
problems. It works flawlessly on SL 7.1. But there are differences: 
system-config-printer is a later version than on SL 6.6 and it was not
necessary to independently get the driver. The driver is available in the
standard SL7 installation.