Hmm. I can reproduce the issue by putting the following line in 
/etc/thunderbird/syspref.js:
pref("toolkit.telemetry.prompted", true);

However, if I set this in prefs.js in the user's profile, after a restart 
Thunderbird has changed this into
user_pref("toolkit.telemetry.prompted", 2);

Changing the syspref option to "2" instead of "true" seems to resolve
the issue.

Those that suffer from this bug, could you look into
/etc/thunderbird/syspref.js if it has any prefs enabled? (The default
file does not change anything).

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https://bugs.launchpad.net/bugs/1213744

Title:
  thunderbird stopped displaying folders

Status in “thunderbird” package in Ubuntu:
  Confirmed

Bug description:
  I didn't use Thunderbird for about a month or so on my netbook and the
  package must have been updated in the meantime.  Unfortunately, TB now
  no longer displays the folder and is thus entirely unusable (see
  screenshot).  This account has used TB for mail for years and
  obviously has a bunch of (IMAP) folders, in fact, they account for
  about 2G of files locally.  The same package works fine on another
  computer.  The problem occurs even in safe-mode.  I am running TB
  17.0.8+build1-0ubuntu0.12.04.1 on precise.

  Another thing I noticed is that TB is extremely slow to start up
  recently.  It takes about a minute of real time or 30s of CPU time
  before even the window is displayed.

  I have downgraded to 17.0.6+build1-0ubuntu0.12.04.1 now and that works
  fine, so this is a regression.

To manage notifications about this bug go to:
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