Sadly, it's still not working. This time it can't find the control called "tbtnTypeafilename". Also, even in the previous version the Location text field was visible, so the problem seems to be that it can't find the controls by name.

This is what happens: an A4 main window opens, then an Open File dialog titled "a4" opens and gets focus, then nothing happens for a few seconds; then it happens again twice (a main window and a dialog for each test). None of these windows gets closed automatically.
It doesn't close random windows anymore.

Is there any way to see which window the "dialog" variable actually captures? or to get the names of the window controls?

Output:

$ make check 
python test.py

** (-c:23319): WARNING **: Trying to register gtype 'WnckWindowState' as enum when in fact it is of type 'GFlags'

** (-c:23319): WARNING **: Trying to register gtype 'WnckWindowActions' as enum when in fact it is of type 'GFlags'

** (-c:23319): WARNING **: Trying to register gtype 'WnckWindowMoveResizeMask' as enum when in fact it is of type 'GFlags'
GTK Accessibility Module initialized
GTK Accessibility Module initialized
GTK Accessibility Module initialized
Failed test case: opening_files.TestOpeningFiles.test_open_existent_file
  Traceback (most recent call last):
    File "tests/opening_files.py", line 24, in test_open_existent_file
      dialog.click('tbtnTypeafilename')
    File "tests/testhelpers.py", line 32, in wrapper
      retval = ldtp_method(self.window_id, *args, **kwargs)
    File "/usr/lib/pymodules/python2.6/ldtp/client.py", line 50, in __call__
      return self.__send(self.__name, args)
    File "/usr/lib/python2.6/xmlrpclib.py", line 1489, in __request
      verbose=self.__verbose
    File "/usr/lib/pymodules/python2.6/ldtp/client.py", line 99, in request
      raise LdtpExecutionError(e.faultString)
  LdtpExecutionError: Unable to find object name "tbtnTypeafilename" in application map
Failed test case: opening_files.TestOpeningFiles.test_open_incorrect_file
  Traceback (most recent call last):
    File "tests/opening_files.py", line 69, in test_open_incorrect_file
      dialog.click('tbtnTypeafilename')
    File "tests/testhelpers.py", line 32, in wrapper
      retval = ldtp_method(self.window_id, *args, **kwargs)
    File "/usr/lib/pymodules/python2.6/ldtp/client.py", line 50, in __call__
      return self.__send(self.__name, args)
    File "/usr/lib/python2.6/xmlrpclib.py", line 1489, in __request
      verbose=self.__verbose
    File "/usr/lib/pymodules/python2.6/ldtp/client.py", line 99, in request
      raise LdtpExecutionError(e.faultString)
  LdtpExecutionError: Unable to find object name "tbtnTypeafilename" in application map
Failed test case: opening_files.TestOpeningFiles.test_open_inexistent_file
  Traceback (most recent call last):
    File "tests/opening_files.py", line 46, in test_open_inexistent_file
      dialog.click('tbtnTypeafilename')
    File "tests/testhelpers.py", line 32, in wrapper
      retval = ldtp_method(self.window_id, *args, **kwargs)
    File "/usr/lib/pymodules/python2.6/ldtp/client.py", line 50, in __call__
      return self.__send(self.__name, args)
    File "/usr/lib/python2.6/xmlrpclib.py", line 1489, in __request
      verbose=self.__verbose
    File "/usr/lib/pymodules/python2.6/ldtp/client.py", line 99, in request
      raise LdtpExecutionError(e.faultString)
  LdtpExecutionError: Unable to find object name "tbtnTypeafilename" in application map
Ran 3 tests (3 failed)