I am now re-phrasing the statement as the local printers are now not being reported as configured.
I have been configuring a CUPS-PDF printer, to allow any application to print to a PDF output file and part of the configuration is to select a pre-defined CUPS printer definition *.ppd file.
When I look at the /etc/cups/ppd/ I see five separate configuration .ppd files for my local printer. Now I can specify a pre-existing *.ppf file in the /etc/cups/ppd/ directory and my printer is back up and running.
Now both my CUPS-PDF and local defined printers are not being displayed in the panel, as the definitions are in the correct location:-
[root@naipaulpc cups]# cd ppd ; ls -l
total 1144
-rw-r--r--. 1 root root 20956 May 18 23:50 CUPS-PDF-Printer.ppd
-rw-r--r--. 1 root root 26259 Apr 14 00:09 DoverClos02.ppd
-rw-r--r--. 1 root root 26259 Apr 14 17:29 DoverClose-Laser02.ppd
-rw-r--r--. 1 root root 26259 Apr 14 17:29 DoverClose-Laser.ppd
-rw-r--r--. 1 root root 26259 Apr 18 00:44 Dover-Laser.ppd
-rw-r--r--. 1 root root 112211 Feb 20 20:13 gbbaslcq.confidential.ppd
-rw-r--r--. 1 root root 112211 Feb 19 22:30 gbbaslcq.ppd
-rw-r--r--. 1 root root 36986 Feb 20 20:13 gbbaslcw.confidential.ppd
-rw-r--r--. 1 root root 36986 Feb 19 22:32 gbbaslcw.ppd
-rw-r--r--. 1 root root 164409 Feb 20 20:13 gbbaslcx.confidential.ppd
-rw-r--r--. 1 root root 164409 Feb 19 22:30 gbbaslcx.ppd
-rw-r--r--. 1 root root 164409 Feb 20 20:13 gbbasld3.confidential.ppd
-rw-r--r--. 1 root root 164409 Feb 19 22:32 gbbasld3.ppd
-rw-r--r--. 1 root root 12262 May 2 00:45 Kyocera-Mita-F-1010.ppd
-rw-r--r--. 1 root root 26259 May 18 23:54 Kyocera-Mita-FS-1010.ppd
-rw-r--r--. 1 root root 7884 Feb 19 13:09 PostScript.ppd
I see some error messages in /var/log/cups directory, but I see messages for all the network printers also, and they are also there.
W [19/May/2012:12:06:34 +0100] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists

rofile id 'Generic-CUPS-PDF-Printer-Gray..' already exists
W [19/May/2012:12:06:34 +0100] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists

rofile id 'Generic-CUPS-PDF-Printer-RGB..' already exists
W [19/May/2012:12:06:34 +0100] failed to CreateDevice: org.freedesktop.ColorManager.AlreadyExists:device id 'cups-Generic-CUPS-PDF-Printer' already exists
W [19/May/2012:12:06:34 +0100] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists

rofile id 'Generic-CUPS-PDF-Printer-Gray..' already exists
W [19/May/2012:12:06:34 +0100] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists

rofile id 'Generic-CUPS-PDF-Printer-RGB..' already exists
W [19/May/2012:12:06:34 +0100] failed to CreateDevice: org.freedesktop.ColorManager.AlreadyExists:device id 'cups-Generic-CUPS-PDF-Printer' already exists
W [19/May/2012:12:06:34 +0100] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists

rofile id 'Generic-CUPS-PDF-Printer-Gray..' already exists
W [19/May/2012:12:06:34 +0100] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists

rofile id 'Generic-CUPS-PDF-Printer-RGB..' already exists
W [19/May/2012:12:06:34 +0100] failed to CreateDevice: org.freedesktop.ColorManager.AlreadyExists:device id 'cups-Generic-CUPS-PDF-Printer' already exists
E [19/May/2012:12:07:05 +0100] Unable to finalize "/etc/cups/printers.conf": Permission denied
W [19/May/2012:12:07:10 +0100] [CGI] Missing NickName and ModelName in /usr/share/cups/model/foomatic-db-ppds/KONICA_MINOLTA/KOC451JX.ppd.gz!
W [19/May/2012:12:07:10 +0100] [CGI] Missing NickName and ModelName in /usr/share/cups/model/foomatic-db-ppds/Brother/BR5070DN_GPL.ppd.gz!
W [19/May/2012:12:07:10 +0100] [CGI] Missing NickName and ModelName in /usr/share/cups/model/foomatic-db-ppds/Epson/eplp950c.ppd.gz!
W [19/May/2012:12:07:10 +0100] [CGI] Missing NickName and ModelName in /usr/share/cups/model/foomatic-db-ppds/Epson/eplp850c.ppd.gz!
W [19/May/2012:12:07:10 +0100] [CGI] Missing NickName and ModelName in /usr/share/cups/model/foomatic-db-ppds/Epson/eplp9100.ppd.gz!
W [19/May/2012:12:07:10 +0100] [CGI] Missing NickName and ModelName in /usr/share/cups/model/foomatic-db-ppds/Epson/eplp830c.ppd.gz!
W [19/May/2012:12:07:10 +0100] [CGI] Missing NickName and ModelName in /usr/share/cups/model/foomatic-db-ppds/Epson/eplp960s.ppd.gz!
W [19/May/2012:12:07:10 +0100] [CGI] Missing NickName and ModelName in /usr/share/cups/model/foomatic-db-ppds/Epson/eplp880c.ppd.gz!
W [19/May/2012:12:07:10 +0100] [CGI] Missing NickName and ModelName in /usr/share/cups/model/foomatic-db-ppds/Epson/eplp980c.ppd.gz!
W [19/May/2012:12:07:10 +0100] [CGI] Missing NickName and ModelName in /usr/share/cups/model/foomatic-db-ppds/Epson/eplp920c.ppd.gz!
W [19/May/2012:12:07:32 +0100] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists

rofile id 'Kyocera-Mita-FS-1010-Gray..' already exists
W [19/May/2012:12:07:32 +0100] failed to CreateDevice: org.freedesktop.ColorManager.AlreadyExists:device id 'cups-Kyocera-Mita-FS-1010' already exists
W [19/May/2012:12:07:33 +0100] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists

rofile id 'Kyocera-Mita-FS-1010-Gray..' already exists
W [19/May/2012:12:07:33 +0100] failed to CreateDevice: org.freedesktop.ColorManager.AlreadyExists:device id 'cups-Kyocera-Mita-FS-1010' already exists
W [19/May/2012:12:07:33 +0100] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists

rofile id 'Kyocera-Mita-FS-1010-Gray..' already exists
W [19/May/2012:12:07:33 +0100] failed to CreateDevice: org.freedesktop.ColorManager.AlreadyExists:device id 'cups-Kyocera-Mita-FS-1010' already exists
E [19/May/2012:12:08:02 +0100] Unable to finalize "/etc/cups/printers.conf": Permission denied
W [19/May/2012:12:08:08 +0100] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists

rofile id 'Kyocera-Mita-FS-1010-Gray..' already exists
W [19/May/2012:12:08:08 +0100] failed to CreateDevice: org.freedesktop.ColorManager.AlreadyExists:device id 'cups-Kyocera-Mita-FS-1010' already exists
W [19/May/2012:12:08:09 +0100] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists

rofile id 'Kyocera-Mita-FS-1010-Gray..' already exists
W [19/May/2012:12:08:09 +0100] failed to CreateDevice: org.freedesktop.ColorManager.AlreadyExists:device id 'cups-Kyocera-Mita-FS-1010' already exists
E [19/May/2012:12:08:38 +0100] Unable to finalize "/etc/cups/printers.conf": Permission denied
E [19/May/2012:12:09:08 +0100] [Job 14] Unable to queue job for destination "CUPS-PDF-Printer"!
W [19/May/2012:12:09:26 +0100] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists

rofile id 'PDF-Printer-Gray..' already exists
:
I am not also able to enable debugging for CUPS, per Fedora 16 diagnostics.