Here's a small test case the reproduce the problem:
Qt Code:
  1. #include <QtGui>
  2.  
  3. int main(int argc, char* argv[])
  4. {
  5. QApplication app(argc, argv);
  6. scene.addWidget(new QTextEdit);
  7. scene.addWidget(new QTextEdit)->moveBy(50, 50);
  8. QGraphicsView view(&scene);
  9. view.show();
  10. return app.exec();
  11. }
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I'd report it as a bug to the Task Tracker.