segmentation fault on classes

[JohannesMunk]

Try it with additional parentheses:

stemp = qobject_cast<ScreenHead*>(slidingStacked->currentWidget()); 
if (stemp)
{
  mtemp = qobject_cast<menu_screen*>(stemp->pSliding->currentWidget()); 
  if (!mtemp)         qDebug() << "mtemp casting failed";       
}   else qDebug() << "stemp casting failed";

stemp = qobject_cast<ScreenHead*>(slidingStacked->currentWidget()); 
if (stemp)
{
  mtemp = qobject_cast<menu_screen*>(stemp->pSliding->currentWidget()); 
  if (!mtemp)         qDebug() << "mtemp casting failed";       
}   else qDebug() << "stemp casting failed";

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Aah: Too slow :->

Joh