[Qt-interest] Runtime Error :- connect: No such slot (Update)

[Wm. G. Urquhart]

Well this get weirder and weirder. In my code I have an existing slot 
declared as:

void typeChanged(int) ;

when I 're-wire' my connect(...) to this slot it works, however; if I 
change the code to use setLegendIndex(int) the connect(...) fails!

Object::connect: No such slot MyApp::setLegendIndex(int) in myapp.cpp:302
Object::connect:  (receiver name: 'MyApp')

With setLegendIndex being declared thus:

void setLegendIndex(int msg) ;

and implemented using this:

void MyApp::setLegendIndex(int msg)
{
	::QMessageBox::information(this, "Set Legend", tr("Value is 
%1").arg(msg)) ;
}

It was suspected that setLegendIndex was getting 'optimised' out but as 
I use an if (...) to connect the signal I call the function when it fails:

pTest = new SignalTest() ;
if (connect(pTest, SIGNAL(Boo(int)), this, SLOT(setLegendIndex(int)), 
Qt::ConnectionType::QueuedConnection))
{
	pTest->Start() ;
}
else
{
	setLegendIndex(5) ;
}

If I could be any more confused I would be, does anyone have any 
suggestions here?

I know what I am trying to do works as my test application verifies 
this, but there must be something subtle that is 'poisoning' my real 
application.

-- 
Thanks

William