I thought I will add some logs, may be this will help.
D [23/Mar/2011:19:09:12 +0100] [Job 1] argv[5]="AP
ColorMatchingMode=APApplicationColorMatching AP
DInputSlot= nocollate com.apple.print.DocumentTicket.PMSpoolFormat=application/pdf com.apple.print.JobInfo.PMJobName=Print\ Test\ Page com.apple.print.PrinterInfo.PMColorDeviceID..n.=48058 com.apple.print.PrintSettings.PMColorSyncProfileID..n.=21294 com.apple.print.PrintSettings.PMCopies..n.=1 com.apple.print.PrintSettings.PMCopyCollate..b. com.apple.print.PrintSettings.PMFirstPage..n.=1 com.apple.print.PrintSettings.PMLastPage..n.=2147483647 com.apple.print.PrintSettings.PMPageRange..a.0..n.=1 com.apple.print.PrintSettings.PMPageRange..a.1..n.=2147483647 pserrorhandler-requested=standard job-uuid=urn:uuid:cc98355a-7ee8-3f99-731c-e17fab7a389b job-originating-host-name=localhost time-at-creation=1300877652 time-at-processing=1300903746"
D [23/Mar/2011:19:09:12 +0100] [Job 1] argv[6]="/private/var/spool/cups/d00001-001"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[0]="<CFProcessPath>"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[1]="CUPS_CACHEDIR=/private/var/spool/cups/cache"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[2]="CUPS_DATADIR=/usr/share/cups"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[3]="CUPS_DOCROOT=/usr/share/doc/cups"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[4]="CUPS_FONTPATH=/usr/share/cups/fonts"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[5]="CUPS_REQUESTROOT=/private/var/spool/cups"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[6]="CUPS_SERVERBIN=/usr/libexec/cups"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[7]="CUPS_SERVERROOT=/private/etc/cups"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[8]="CUPS_STATEDIR=/private/etc/cups"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[9]="HOME=/private/var/spool/cups/tmp"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[10]="PATH=/usr/libexec/cups/filter:/usr/bin:/usr/sbin:/bin:/usr/bin"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[11]="SERVER_ADMIN=root@Liudmyla-Nelsons-MacBook-Pro.local"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[12]="SOFTWARE=CUPS/1.4.6"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[13]="TMPDIR=/private/var/spool/cups/tmp"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[14]="USER=root"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[15]="CUPS_SERVER=/private/var/run/cupsd"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[16]="CUPS_ENCRYPTION=IfRequested"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[17]="IPP_PORT=631"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[18]="CHARSET=utf-8"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[19]="LANG=en_US.UTF-8"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[20]="APPLE_LANGUAGE=en-US"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[21]="PPD=/private/etc/cups/ppd/
5600_6600_Series<MAC:0020003bdbe8>.ppd"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[22]="RIP
MAXCACHE=8m"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[23]="CONTENT_TYPE=application/pdf"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[24]="DEVICE_URI=lexnet3://0020003bdbe8:1"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[25]="PRINTER_INFO=5600-6600 Series <MAC:0020003bdbe8>"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[26]="PRINTER_LOCATION=liudmyla-nelsons-macbook-pro.local"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[27]="PRINTER=
5600_6600_Series<MAC:0020003bdbe8>"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[28]="CUPS_FILETYPE=document"
D [23/Mar/2011:19:09:12 +0100] [Job 1] envp[29]="FINAL
CONTENT_TYPE=printer/_5600_6600_Series<MAC:0020003bdbe8>"
D [23/Mar/2011:19:09:12 +0100] [Job 1] Started filter /usr/libexec/cups/filter/cgpdftoraster (PID 405)
D [23/Mar/2011:19:09:12 +0100] [Job 1] Started filter /Library/Printers/Lexmark/filter/CUPSDriver.app/Contents/MacOS/CUPSDriver (PID 406)
D [23/Mar/2011:19:09:12 +0100] [Job 1] Started backend /usr/libexec/cups/backend/lexnet3 (PID 407)
D [23/Mar/2011:19:09:12 +0100] [Job 1] Opening the print file and connection...
D [23/Mar/2011:19:09:12 +0100] [Job 1] `/private/var/spool/cups/d00001-001' has 1 pages.
D [23/Mar/2011:19:09:12 +0100] [Job 1] cgpdftoraster - opened PPD file "/private/etc/cups/ppd/
5600_6600_Series<MAC:0020003bdbe8>.ppd"...
D [23/Mar/2011:19:09:12 +0100] [Job 1] cgpdftoraster: size->width = 612, size->length = 792, size->top = 792, size->bottom = 0, size->left = -0, size->right = 612
D [23/Mar/2011:19:09:12 +0100] [Job 1] cgpdftoraster: PreferredRotation = -90
D [23/Mar/2011:19:09:12 +0100] [Job 1] cgpdftoraster - languageLevel = 3, mediaBox.size.width = 612, mediaBox.size.height = 792
D [23/Mar/2011:19:09:12 +0100] [Job 1] band width = 5100, bytesPerRow = 20400, band height = 514, height = 6600
D [23/Mar/2011:19:09:12 +0100] [Job 1] context width = 5100, height = 514, bitsPerComponent = 8, bitsPerPixel = 32, bytesPerRow = 20400, bitmapInfo = 5, resolution = (600.000000, 600.000000)
D [23/Mar/2011:19:09:12 +0100] [Job 1] NOT using display list
D [23/Mar/2011:19:09:12 +0100] [Job 1] cgpdftoraster: bytes written for sheet 1 = 100980000
D [23/Mar/2011:19:09:12 +0100] [Job 1] Backend returned status -10 (crashed)
D [23/Mar/2011:19:09:12 +0100] [Job 1] Printer stopped due to backend errors; please consult the error_log file for details.
D [23/Mar/2011:19:09:12 +0100] [Job 1] End of messages
D [23/Mar/2011:19:09:12 +0100] [Job 1] printer-state=5(stopped)
D [23/Mar/2011:19:09:12 +0100] [Job 1] printer-state-message="/usr/libexec/cups/backend/lexnet3 failed"
D [23/Mar/2011:19:09:12 +0100] [Job 1] printer-state-reasons=paused