I can confirm that this behaviour is still present, at least in the latest patch set for the 16.04 LTS release. Once 18.04 becomes an upgrade option for 16.04 later this month I can re-test on the newest version.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/583577 Title: "View by Threads with Unread" results in no ability to read some messages Status in thunderbird package in Ubuntu: Incomplete Bug description: Binary package hint: thunderbird On a fairly regular basis Thunderbird will show me messages that I can't read or otherwise interact with when viewing in "Threads with Unread" mode. In the attached image there are several threads that clicking on the '+' sign has absolutely no action. I cannot click the green circle to mark the messages as read either. This doesn't happen ALL the time, but seems to happen in particular when duplicate messages are delivered (in this case a yahoo! groups mailing list that occasionally sends duplicates) ProblemType: Bug DistroRelease: Ubuntu 10.04 Package: thunderbird 3.0.4+nobinonly-0ubuntu4 ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2 Uname: Linux 2.6.32-22-generic x86_64 NonfreeKernelModules: fglrx Architecture: amd64 Date: Thu May 20 15:22:39 2010 ProcEnviron: PATH=(custom, user) LANG=en_CA.utf8 SHELL=/bin/bash SourcePackage: thunderbird To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/583577/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp