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copied!<p>Sorry, I've been unable to reproduce the segfaults you are seeing. Here's the full source code of the application I tried to reproduce your crash with (Qt 4.8.1, PyQt 4.9.1, Python 2.7.3, Kubuntu Precise):</p> <pre><code>#!/usr/bin/env python import sys from PyQt4 import QtCore, QtGui class AppStatus(object): def __init__(self): self.timer = None class ExperimentAnalyzer(QtGui.QMainWindow): def __init__(self, parent=None): super(ExperimentAnalyzer, self).__init__(parent) elayout = QtGui.QVBoxLayout() self.count = 0 self.appStatus = AppStatus() everything = QtGui.QWidget(self) everything.setLayout(elayout) button = QtGui.QPushButton("Start/stop timer", self) self.connect(button, QtCore.SIGNAL("clicked()"), self.playOrPause) elayout.addWidget(button) button = QtGui.QPushButton("Load experiment", self) self.connect(button, QtCore.SIGNAL("clicked()"), self.loadExperiment) elayout.addWidget(button) self.setCentralWidget(everything) def loadExperiment(self): directory = QtGui.QFileDialog.getExistingDirectory(self, "Select Directory") def nextFrame(self): self.count += 1 print self.count def playOrPause(self): if self.appStatus.timer is None: self.appStatus.timer = QtCore.QTimer(self) self.appStatus.timer.connect(self.appStatus.timer, QtCore.SIGNAL("timeout()"), self.nextFrame) self.appStatus.timer.start(40) else: self.appStatus.timer.stop() self.appStatus.timer = None if __name__ == "__main__": app = QtGui.QApplication(sys.argv) mainwin = ExperimentAnalyzer(None) mainwin.show() app.exec_() </code></pre> <p>If this test application doesn't crash for you, then the problem is in code that you haven't shown us.</p>

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