Running MFCJ825DW with RPM drivers from Brother.
Excerpt from error-log:
[doug@dougshost 2013-08-20]$ tail -f /var/log/cups/error_log
W [08/Nov/2014:00:55:00 +1100] [CGI] Missing NickName and ModelName in /usr/share/cups/model/foomatic-db-ppds/Epson/eplp960s.ppd.gz!
W [08/Nov/2014:00:55:00 +1100] [CGI] Missing NickName and ModelName in /usr/share/cups/model/foomatic-db-ppds/KONICA_MINOLTA/KOC451JX.ppd.gz!
E [08/Nov/2014:00:55:01 +1100] [cups-driverd] Bad driver information file "/usr/share/cups/model/foomatic-db-ppds/Kyocera/ReadMe.htm"!
W [08/Nov/2014:00:55:01 +1100] [CGI] Missing NickName and ModelName in /usr/share/cups/model/foomatic-db-ppds/Brother/BR5070DN_GPL.ppd.gz!
E [08/Nov/2014:00:55:02 +1100] [cups-driverd] Skipping "/usr/local/share/ppd": loop detected!
E [08/Nov/2014:00:55:02 +1100] [cups-driverd] Skipping "/usr/share/ppd": loop detected!
E [08/Nov/2014:00:55:02 +1100] [cups-driverd] Skipping "/opt/share/ppd": loop detected!
W [08/Nov/2014:00:58:54 +1100] CreateProfile failed: org.freedesktop.ColorManager.AlreadyExists:profile id 'MFCJ825DW-Gray..' already exists
W [08/Nov/2014:00:58:54 +1100] CreateProfile failed: org.freedesktop.ColorManager.AlreadyExists:profile id 'MFCJ825DW-RGB..' already exists
E [08/Nov/2014:01:02:03 +1100] Unknown directive BrowseAddress on line 18 of /etc/cups/cupsd.conf.
Those loops look suspicious!