thunderbird message preview pane do not honor global character encoding settings

character encoding is set to UTF-8 for incoming and outgoing messages in Edit > Preferences : Display > Advanced.
In the review pane, the message is shown with Western ISO-8859-1 as seen in View > Character Encoding. When manually change it to UTF-8 it work, but when clicking on other message and going back, te Western character encoding is restored.

Is there other global character encoding hidden in somwhere else?

If not, this is defenitey a bug.

P.S: The "auto-detect" menu in View > Character Encoding changes nothing. I tried set auto detect to "off" and "Universal" and no change.

Best Regards,

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: thunderbird 17.0.2+build1-0ubuntu0.12.04.1
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
NonfreeKernelModules: fglrx
AddonCompatCheckDisabled: False
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
BuildID: 20130106044124
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xfeb00000 irq 16'
   Mixer name : 'Realtek ALC892'
   Components : 'HDA:10ec0892,10438410,00100302'
   Controls : 44
   Simple ctrls : 21
Card1.Amixer.info:
 Card hw:1 'U0x46d0x991'/'USB Device 0x46d:0x991 at usb-0000:00:13.2-2, high speed'
   Mixer name : 'USB Mixer'
   Components : 'USB046d:0991'
   Controls : 2
   Simple ctrls : 1
Card1.Amixer.values:
 Simple mixer control 'Mic',0
   Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
   Capture channels: Mono
   Limits: Capture 0 - 8
   Mono: Capture 6 [75%] [27.00dB] [off]
Card2.Amixer.info:
 Card hw:2 'Generic'/'HD-Audio Generic at 0xfea40000 irq 89'
   Mixer name : 'ATI R6xx HDMI'
   Components : 'HDA:1002aa01,00aa0100,00100200'
   Controls : 6
   Simple ctrls : 1
Card2.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Channel: Unavailable
Date: Tue Jan 29 13:20:58 2013
ForcedLayersAccel: False
IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationMedia: Xubuntu 12.04 "Precise Pangolin" - Beta amd64 (20120228)
IpRoute:
 default via 192.168.1.1 dev wlan0 proto static
 169.254.0.0/16 dev wlan0 scope link metric 1000
 192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.33 metric 2
MarkForUpload: True
Plugins:
 Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
 IcedTea-Web Plugin (using IcedTea-Web 1.2 (1.2-2ubuntu1.3)) - /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so (icedtea-7-plugin)
PrefSources:
 prefs.js
 [Profile]/extensions/masterpasswordtimeoutplus@vano/defaults/preferences/masterpasswordplus.js
 [Profile]/extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}/defaults/preferences/lightning.js
 [Profile]/extensions/{847b3a00-7ab1-11d4-8f02-006008948af5}/defaults/preferences/enigmail.js
ProcEnviron:
 LANGUAGE=en_US:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Profiles: Profile0 (Default) - LastVersion=17.0.2/20130106044124 (In use)
RelatedPackageVersions: icedtea-7-plugin 1.2-2ubuntu1.3
RunningIncompatibleAddons: False
SourcePackage: thunderbird
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/02/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0901
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: M5A99X EVO
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0901:bd12/02/2011:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnM5A99XEVO:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To be filled by O.E.M.
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: To be filled by O.E.M.