Thunderbird does not have clickable links in compact thread view

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:10.0) Gecko/20100101 Firefox/10.0
Build ID: 20120130192601

Steps to reproduce:

I enables the thread-view in thunderbird (10.0 on ubuntu 12,04) on my imap-mails, where i have this tree-menu for messages belonging to the same topic. e.g. bug-mails

Actual results:

If i close a thread, so that thunderbird is showing multiple mails in one window (http://alpha-unix.de/~iceroot/ubuntu/thunderbird-links-not-clickable.png) links are not clickable anymore, just when i reopen the thread and pick the mail directly i can click on the mail (http://alpha-unix.de/~iceroot/ubuntu/thunderbird-clickable-again.png)

Expected results:

Link should be clickable

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: thunderbird 10.0+build1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-12.20-generic 3.2.2
Uname: Linux 3.2.0-12-generic i686
AddonCompatCheckDisabled: False
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
ApportVersion: 1.91-0ubuntu1
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: michael 1631 F.... pulseaudio
BuildID: 20120130192408
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf7eb8000 irq 45'
   Mixer name : 'Realtek ALC269'
   Components : 'HDA:10ec0269,1043831a,00100004'
   Controls : 17
   Simple ctrls : 9
Channel: release
Date: Thu Feb 2 15:59:54 2012
EcryptfsInUse: Yes
ForcedLayersAccel: False
IncompatibleExtensions: German Dictionary - <email address hidden>, Version=2.0.2, minVersion=1.9a8pre, maxVersion=2.0.*, Location=app-profile, Type=extension, Active=Yes
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110426)
IpRoute:
 default via 192.168.178.1 dev wlan0 proto static
 192.168.178.0/24 dev wlan0 proto kernel scope link src 192.168.178.39 metric 2
Plugins: Shockwave Flash - Lib=libflashplayer.so, Location=/usr/lib/flashplugin-installer
Prefs:
 places.database.lastMaintenance - 1327653704
 extensions.lastAppVersion - 10.0
 network.cookie.prefsMigrated - true
 places.history.expiration.transient_optimal_database_size - 25187696
 places.history.expiration.transient_current_max_pages - 16535
ProcEnviron:
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
Profiles: Profile0 (Default) - LastVersion=10.0/20120130192408 (Running)
RunningIncompatibleAddons: True
SourcePackage: thunderbird
UpgradeStatus: Upgraded to precise on 2011-12-04 (60 days ago)
dmi.bios.date: 06/11/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2103
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: 901
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: x.xx
dmi.chassis.asset.tag: 0x00000000
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTek Computer INC.
dmi.chassis.version: x.x
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2103:bd06/11/2009:svnASUSTeKComputerINC.:pn901:pvrx.x:rvnASUSTeKComputerINC.:rn901:rvrx.xx:cvnASUSTekComputerINC.:ct10:cvrx.x:
dmi.product.name: 901
dmi.product.version: x.x
dmi.sys.vendor: ASUSTeK Computer INC.