Access violation - code c0000005 exception closes my application

[Vallikumar]

My VC++ application sometimes closes with an "Access violation - code c0000005" exception, right in the moment when selecting a TabPage in a windows form TabControl. This access violation occurs at below line m__mychrtPtr->raw_Import( Cfx62::FileFormat_Binary, variant1 );

Sample Tab View code

void CGraphDlg::ViewChartFXGraph(Cfx62::_ChartPtr pMyChart)

{

IStreamPtr pMyStream = NULL;

VARIANT variant1;

if ( SUCCEEDED( CreateStreamOnHGlobal( NULL, TRUE, &pMyStream ) ) )

{

  V_VT( &variant1 ) = VT_STREAM;

  V_UNKNOWN( &variant1 ) = pMyStream;

  pMyChart->PutFileMask( (Cfx62::FileMask)( Cfx62::FileMask_All ) );

  pMyChart->raw_Export( Cfx62::FileFormat_Binary, variant1 );

LARGE_INTEGER large;

  ULARGE_INTEGER ularge;

  large.LowPart = 0;

  large.HighPart = 0;

  pMyStream->Seek( large, STREAM_SEEK_SET, &ularge );

  m__mychrtPtr->raw_Import( Cfx62::FileFormat_Binary, variant1 );

  VariantClear(&variant1);

  }

}

The faulting module seems to be a COM object (ChartFX Client Server 6.2)  

Using WinDbg, I caught it on the unmanaged side, inside ChartFX.ClientServer.Core.dll (that's a COM charting component we are using)

(1068.10bc): Access violation - code c0000005 (first chance)

First chance exceptions are reported before any exception handling.

This exception may be expected and handled.

eax=0d41e770 ebx=00000001 ecx=0022dcc8 edx=0000000e esi=00000007 edi=00000012

eip=3172b8d7 esp=0022dca0 ebp=0022dcc0 iopl=0 nv up ei ng nz ac po cy

cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000 efl=00010293

*** WARNING: Unable to verify checksum for D:\x\y\z\bin\ChartFX.ClientServer.Core.dll

*** ERROR: Symbol file could not be found.  Defaulted to export symbols for D:\x\y\z\bin\ChartFX.ClientServer.Core.dll -

ChartFX_ClientServer_Core!Ordinal2826+0x41:

3172b8d7 ff30   push   dword ptr [eax]   ds:0023:0d41e770=????????

 

I have several Chart instances in several TabPages, and this usually happens while I am switching the tabs. If someone could point me to the next step I should do to find the actual cause or solution, I would be very grateful. 

 

Thanks

Vallikumar