Orange Canvas: pythonw.exe has stopped working crashing

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I have a random problem with Orange. I developed a widget and I have a button who opens a new window for some settings. The program works fine, but, at a some point, totally randomly, pythonw.exe stops working. It's only when I use the window for settings. The problem happens totally randomly, but more often when I open the window. I tried to make my window with OWW.OWBaseWidget, OWW.OWWidget and OWW.QDialog. I tried too with pythonw.exe and python.exe. I did the same thing that Set Colors of the widget Data Table in Data. But this one crashed too after a moment.

So where is the problem? Orange? Python? Anything else? I have no error message.

I have Windows 8.1, python 2.7 and Orange 2.7.8.

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Malain On

Is this helpful? I am on a french version of windows:

Description

Chemin d’accès de l’application défaillante : C:\Python27\pythonw.exe

Signature du problème Nom d’événement du problème : APPCRASH

Nom de l’application: pythonw.exe

Version de l’application: 0.0.0.0

Horodatage de l’application: 4df4b9cc

Nom du module par défaut: QtCore4.dll

Version du module par défaut: 4.7.0.0

Horodateur du module par défaut: 4cbe7403

Code de l’exception: c0000005

Décalage de l’exception: 000c7f03

Version du système: 6.3.9600.2.0.0.768.101

Identificateur de paramètres régionaux: 4108

Information supplémentaire n° 1: 5861

Information supplémentaire n° 2: 5861822e1919d7c014bbb064c64908b2

Information supplémentaire n° 3: 84a0

Information supplémentaire n° 4: 84a09ea102a12ee665c500221db8c9d6

Informations complémentaires sur le problème ID de compartiment : 3a2b179ef07f0847bf9f72213260bff5 (-1296411611)