CUPS reports 'Filter failed' and 'Idle - Can't detect file type' on printing a test page.

I have an Epson Stylus Office BX925FWD, or what I think is an Epson Workforce 840 series printer. In Quantal (Not Precise - then it was fine...), printing a test page results in 'Idle - can't detect file type' in the Red Hat system-config-printers application, AKA 'Printing' (the default printing manager', and 'Filter failed' in View Attributes window.
This didn't happen in Precise, and it is likely a fault in cups, not Red Hat's utility, as I had set the Printer up using localhost:631 and returned the same error...

http://i49.tinypic.com/2jcf2w5.png

This worked previously in quantal, so it is probably caused by an update, and printing anything else works fine.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: cups 1.6.1-0ubuntu11
ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
Uname: Linux 3.5.0-18-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
Date: Sat Nov 17 20:57:27 2012
InstallationDate: Installed on 2012-10-18 (29 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
Lpstat: device for Epson: dnssd://EPSONB8C6F8%20(Epson%20Stylus%20Office%20BX925)._printer._tcp.local/
MachineType: System manufacturer System Product Name
MarkForUpload: True
Papersize: a4
PpdFiles: Epson: Epson Stylus Office BX925 Series - epson-inkjet-printer 1.0.0-1lsb3.2 (Seiko Epson Corporation LSB 3.2)
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-18-generic root=UUID=4d7ee3d1-aab7-44a7-9e76-278ed8191974 ro quiet splash vt.handoff=7
SourcePackage: cups
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/04/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1201
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M5A78L-M LX V2
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1201:bd09/04/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM5A78L-MLXV2:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer