Problems running xx-potemplate-admin.txt in Gutsy

In a branch without changes, xx-potemplate-admin.txt pagetest fails with:

carlos@aragorn:~/Work/Canonical/trivial$ ./test.py -vv --test=xx-potemplate-admin.txt
Running tests at level 1
Running canonical.testing.layers.PageTestLayer tests:
  Set up canonical.testing.layers.BaseLayer in 0.040 seconds.
  Set up canonical.testing.layers.DatabaseLayer in 0.000 seconds.
  Set up canonical.testing.layers.LibrarianLayer in 3.957 seconds.
  Set up canonical.testing.layers.LaunchpadLayer in 0.000 seconds.
  Set up canonical.testing.layers.FunctionalLayer in 7.525 seconds.
  Set up canonical.testing.layers.LaunchpadFunctionalLayer in 0.000 seconds.
  Set up canonical.testing.layers.PageTestLayer in 0.000 seconds.
  Running:
    /home/carlos/Work/Canonical/trivial/lib/canonical/launchpad/ftests/../pagetests/rosetta/xx-potemplate-admin.txt

Failure in test /home/carlos/Work/Canonical/trivial/lib/canonical/launchpad/ftests/../pagetests/rosetta/xx-potemplate-admin.txt
Failed doctest test for xx-potemplate-admin.txt
  File "/home/carlos/Work/Canonical/trivial/lib/canonical/launchpad/ftests/../pagetests/rosetta/xx-potemplate-admin.txt", line 0

----------------------------------------------------------------------
File "/home/carlos/Work/Canonical/trivial/lib/canonical/launchpad/ftests/../pagetests/rosetta/xx-potemplate-admin.txt", line 26, in xx-potemplate-admin.txt
Failed example:
    print browser.getControl(name='field.header').value
Differences (ndiff with -expected +actual):
    - Project-Id-Version: PACKAGE VERSION
    + Project-Id-Version: PACKAGE VERSION
    ? +
    - Report-Msgid-Bugs-To:
    + Report-Msgid-Bugs-To:
    ? ++
    - POT-Creation-Date: 2005-08-25 14:56+0200
    + POT-Creation-Date: 2005-08-25 14:56+0200
    ? +
    - PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE
    + PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE
    ? +
    + Last-Translator: FULL NAME <EMAIL@ADDRESS>Language-Team: LANGUAGE <email address hidden>MIME-Version: 1.0
    - Last-Translator: FULL NAME <EMAIL@ADDRESS>
    - Language-Team: LANGUAGE <email address hidden>
    - MIME-Version: 1.0
    - Content-Type: text/plain; charset=CHARSET
    + Content-Type: text/plain; charset=CHARSET
    ? +
    - Content-Transfer-Encoding: 8bit
    + Content-Transfer-Encoding: 8bit
    ? +
    - Plural-Forms: nplurals=INTEGER; plural=EXPRESSION;
    + Plural-Forms: nplurals=INTEGER; plural=EXPRESSION;
    ? +
      <BLANKLINE>
----------------------------------------------------------------------
File "/home/carlos/Work/Canonical/trivial/lib/canonical/launchpad/ftests/../pagetests/rosetta/xx-potemplate-admin.txt", line 70, in xx-potemplate-admin.txt
Failed example:
    print admin_browser.getControl(name='field.header').value
Differences (ndiff with -expected +actual):
    - Project-Id-Version: PACKAGE VERSION
    + Project-Id-Version: PACKAGE VERSION
    ? +
    - Report-Msgid-Bugs-To:
    + Report-Msgid-Bugs-To:
    ? ++
    - POT-Creation-Date: 2005-08-25 14:56+0200
    + POT-Creation-Date: 2005-08-25 14:56+0200
    ? +
    - PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE
    + PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE
    ? +
    + Last-Translator: FULL NAME <EMAIL@ADDRESS>Language-Team: LANGUAGE <email address hidden>MIME-Version: 1.0
    - Last-Translator: FULL NAME <EMAIL@ADDRESS>
    - Language-Team: LANGUAGE <email address hidden>
    - MIME-Version: 1.0
    - Content-Type: text/plain; charset=CHARSET
    + Content-Type: text/plain; charset=CHARSET
    ? +
    - Content-Transfer-Encoding: 8bit
    + Content-Transfer-Encoding: 8bit
    ? +
    - Plural-Forms: nplurals=INTEGER; plural=EXPRESSION;
    + Plural-Forms: nplurals=INTEGER; plural=EXPRESSION;
    ? +
      <BLANKLINE>

  Ran 10 tests with 1 failures and 0 errors in 75.842 seconds.
Tearing down left over layers:
  Tear down canonical.testing.layers.PageTestLayer in 0.000 seconds.
  Tear down canonical.testing.layers.LaunchpadFunctionalLayer in 0.000 seconds.
  Tear down canonical.testing.layers.LaunchpadLayer in 0.000 seconds.
  Tear down canonical.testing.layers.LibrarianLayer in 0.304 seconds.
  Tear down canonical.testing.layers.FunctionalLayer ... not supported
  Tear down canonical.testing.layers.DatabaseLayer in 0.041 seconds.
  Tear down canonical.testing.layers.BaseLayer in 0.000 seconds.

Tests with failures:
   /home/carlos/Work/Canonical/trivial/lib/canonical/launchpad/ftests/../pagetests/rosetta/xx-potemplate-admin.txt

For some reason, using Gutsy, pagetests do something unexpected, although I don't know what's exactly happening...