This is https://bugzilla.mozilla.org/show_bug.cgi?id=754780 and fixed in the next beta. In the meantime, you can just delete your global- messages-db.sqlite
** Bug watch added: Mozilla Bugzilla #754780 https://bugzilla.mozilla.org/show_bug.cgi?id=754780 ** Changed in: thunderbird (Ubuntu) Importance: Undecided => Medium ** Changed in: thunderbird (Ubuntu) Status: Confirmed => Fix Committed ** Also affects: thunderbird via https://bugzilla.mozilla.org/show_bug.cgi?id=754780 Importance: Unknown Status: Unknown -- 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/990331 Title: Big Thunderbird problems after Ubuntu bugfix update Status in Mozilla Thunderbird Mail and News: Unknown Status in “thunderbird” package in Ubuntu: Fix Committed Bug description: Thunderbird 11.0.1 Ubuntu 10.04 LTS 64bit After a large update of the system Thunderbird (I don't know if it has been updated too) has problems all over. 1. the error console has lots of entries here is the very first: Timestamp: 28.04.2012 09:13:48 Error: this.asyncConnection is null Source File: resource:///modules/gloda/datastore.js Line: 1406 2. the add-ons manager is stuck with the message "loading" and a whole bunch more of that stuff! It is very disappointing to run a regular (bugfix) update with this result!!! Does anybody at the Ubuntu Team feel responsible? Thank you for your help. To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/990331/+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