Thanks for that.
Good to know its not something I'm doing.
I've got around it by using
Qt Code:
  1. this->horizontalHeader()->viewport()->installEventFilter(this);
To copy to clipboard, switch view to plain text mode 
and implementing the
Qt Code:
  1. bool eventFilter(QObject *obj, QEvent *event)
To copy to clipboard, switch view to plain text mode 
method.