AIS_Manipulator unresponsive (7.9)

could have sworn this worked before upgrading to 7.9.0...

I've got a problem with AIS_Manipulator::HasActiveMode() never returning true...

Implementing AIS_Manipulator as:

void Ccanvas::showManipulator(CCutShape *selection)
{
    if (m_Manipulator->IsAttached())
        m_Manipulator->Detach();
     AIS_Manipulator::OptionsForAttach anOptions;
     anOptions.SetAdjustPosition(true);
     anOptions.SetAdjustSize(false);
     anOptions.SetEnableModes(true);
   // m_Manipulator->SetModeActivationOnDetection(true);
    m_Manipulator->Attach (selection, anOptions);
     //done internally
    //m_Manipulator->EnableMode(AIS_MM_Translation);
    //m_Manipulator->EnableMode(AIS_MM_Rotation);

    _context->Display(m_Manipulator, true);
}

then corresponding calls in MouseEvent/MouseMove:

void Ccanvas::mousePressEvent(QMouseEvent* event)
{

    if (event->button() == Qt::LeftButton)
    {
        // Save the current mouse coordinate in min.
        m_mouseLDown.viewx = x;
        m_mouseLDown.viewy = y;
        _view->Convert(m_mouseLDown.viewx, m_mouseLDown.viewy, m_mouseLDown.canvasx, m_mouseLDown.canvasy, m_mouseLDown.canvasz);

        if (m_Manipulator->HasActiveMode())
        {
            m_Manipulator->StartTransform (x, y, _view);
        }
        update();
    }

}

//--------------------------------------------------------------------------------------
void Ccanvas::mouseMoveEvent(QMouseEvent* event)
{
    double x = event->position().x();
    double y = event->position().y();

    if (m_Manipulator->HasActiveMode())
    {
        m_Manipulator->Transform(x, y, _view);
        _view->Redraw();
    }
    update();
}

Chasing into the source code, I can see [myCurrentMode] is set perpetually to AIS_MM_None, and I can't find where its set to anything else?

Can anyone sanity check this for me, sure I must be doing something stupid here?