Sometimes I also get:
Qt Code: 
  1. warning: ASSERT: "i >= 0 && i < size()" in file ../../include/QtCore/../../src/corelib/tools/qbitarray.h, line 121
  2.  
  3. warning: QPaintEngine::setSystemClip: Should not be changed while engine is active
  4.  
  5. warning: QPaintEngine::setSystemClip: Should not be changed while engine is active
  6.  
  7. warning: QWidgetPrivate::beginSharedPainter: Painter is already active
  8.  
  9. warning: QPainter::begin: A paint device can only be painted by one painter at a time.
  10.  
  11. warning: QPainter::begin: A paint device can only be painted by one painter at a time.
  12.  
  13. warning: ASSERT: "sharedPainter ? sharedPainter->isActive() : true" in file kernel\qwidget.cpp, line 4420
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