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simple state machine class not updating mainwindow

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I have two main windows, the first launches the state machine class which creates a second main window. The second window then is modified using , for example     _pushbutton->setVisible(true);  // or false Each state (corresponds to a method) is generally connected to the next state using slots; the signal comes from the pushbutton of the prior state. But my problem is that I do not see updates sometimes, even when I do :    _pushbutton->setVisible(bool);     _pushbutton->update();       _lineedit->setVisible(bool);       _lineedit->update(); I tried even to create a new MainWindow for every state to no avail. I tried using show()     _mainwindow->show(); after every update also. My state machine seems to work for the first few simple states with just changes to a QLabel. Once the lineEdit widget is used, the updates seem to falter. ( I was successful in obtaining the text input however.) Also in general am I connecting my states correctly ? (Can this design cause the stack to explode ? There are no cycles here BTW, I swear.) I have two ways to connect, either through a direct call or by a connect: void State::state3() {     ...   state4(); // direct call }   void State::state4() {   ...   connect(_pushbutton, SIGNAL(clicked()), this, SLOT(state5()));    // by connect } I had trouble seeing an update esp after a sleep() / Sleep() / usleep() call (I tried all 3) as well.

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