playonlinux crashes at startup Ubuntu 12.04

Status changed to 'Confirmed' because the bug affects multiple users.

andre@Portatil:~$ playonlinux
[install_plugins] Message: Verificando plug-in: Offline PlayOnLinux...
[Check_OpenGL] Message: 32bits direct rendering is enabled
[install_plugins] Message: Verificando plug-in: Capture...
[install_plugins] Message: Verificando plug-in: Transgaming Cedega...
Traceback (most recent call last):
  File "mainwindow.py", line 784, in <module>
    app = PlayOnLinuxApp(redirect=False)
  File "/usr/lib/python2.7/dist-packages/wx-2.6-gtk2-unicode/wx/_core.py", line 7700, in __init__
    self._BootstrapApp()
[install_plugins] Message: Verificando plug-in: Wine Import...
  File "/usr/lib/python2.7/dist-packages/wx-2.6-gtk2-unicode/wx/_core.py", line 7352, in _BootstrapApp
    return _core_.PyApp__BootstrapApp(*args, **kwargs)
  File "mainwindow.py", line 730, in OnInit
    self.frame = MainWindow(None, -1, os.environ["APPLICATION_TITLE"])
  File "mainwindow.py", line 281, in __init__
    self.jauge_update.Pulse()
AttributeError: 'Gauge' object has no attribute 'Pulse'
Exception TypeError: 'join() takes exactly 2 arguments (1 given)' in <module 'threading' from '/usr/lib/python2.7/threading.pyc'> ignored
Exception in thread Thread-2 (most likely raised during interpreter shutdown):
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 551, in __bootstrap_inner
  File "mainwindow.py", line 84, in run
  File "mainwindow.py", line 66, in real_check
<type 'exceptions.TypeError'>: 'NoneType' object is not callable
Unhandled exception in thread started by <bound method POLWeb.__bootstrap of <POLWeb(Thread-2, started -1280312512)>>
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/apport_python_hook.py", line 50, in apport_excepthook
    if not enabled():
TypeError: 'NoneType' object is not callable

Original exception was:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 524, in __bootstrap
    [install_plugins] Message: Verificando plug-in: Wine Look...
Traceback (most recent call last):
  File "mainwindow.py", line 30, in <module>
    import wx
ImportError: No module named wx
andre@Portatil:~$ [install_plugins] Message: Verificando plug-in: Screen Capture...
[install_plugins] Message: Verificando plug-in: PlayOnLinux Vault...

4.0.19 available on PlayOnLinux's website solves this problem