Errors after getting chart title.

[User (Legacy)]

I'm getting fatal errors when I read the chart title in and out of the chart 

object. Given the following (VC6) code fragement: 

    // Begin 

    CString _strGraphTitle; 

     IChartFXPtr _pChartFX; 

    _pChartFX.CreateInstance(__uuidof(ChartFX)); 

     _pChartFX->PutTitle(CHART_TOPTIT, "First Title"); 

     _strGraphTitle = _pChartFX->GetTitle(CHART_TOPTIT); 

     ASSERT( _strGraphTitle == "First Title" ); 

     _pChartFX->PutTitle(CHART_TOPTIT, "Second title"); 

    // End 

Everything works fine until the second call to PutTitle(), which generates 

"Debug Error R6025 - pure virtual function call." 

I can make as many calls to PutTitle() before the GetTitle() as I want, but 

as soon as I make the first call to GetTitle(), my smartpointer seems to 

somehow be releasing the object, causing the next PutTitle() call to die. 

Can anyone explain this to me? 

Thx. 

Andrew