Multiple calls to a C# COM object from unmanaged C

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So I took a look at the article Calling Managed .NET C# COM Objects from Unmanaged C++ Code[] and was able to create my form and call it without issue. Now I would like to call the form multiple times allowing user to provide input each time. C or C++ it doesn't really matter and a mix of it is fine for my solution.

Is there something I'm missing? Shouldn't I be able to simply place the line below into a for loop?:

pDotNetCOMPtr->ShowCOMDialog ();

The form never appears after the first iteration. It's possible I'm misunderstanding the order of things, but I don't feel I should have to call CoInitialize or CreateInstance() again. Below is the simple code sample I'm using.

int _tmain(int argc, _TCHAR* argv[])
{
    //for(int i = 0; i < 4;i++)
    {
        CoInitializeEx(NULL, COINIT_MULTITHREADED);

        int theResult = -1;
        long result = 0;
        COMTesting::IProgramPtr pDotNetCOMPtr;
        HRESULT hRes = pDotNetCOMPtr.CreateInstance(COMTesting::CLSID_Program);

        for(int i = 0; i < 4;i++)
        {  

            if (hRes == S_OK)
            {
                BSTR MyBstr = SysAllocString(L"Proof I can Pass a String!");
                BSTR myReturnStr;
                result = pDotNetCOMPtr->LaunchDialog(MyBstr, &myReturnStr);
                printf("The Result was %i\r\n", result);
                char *p = _com_util::ConvertBSTRToString(myReturnStr);
                printf(p);
                printf("\r\n"); 
                printf("Press Any Key to Continue\r\n");
                getchar();
                delete [] p;
            }
        }

        CoUninitialize ();
    }
    return 0;
}

Thank you so much for anyone that could provide assistance, or point me in the right direction if I'm misunderstanding how the COM calls are working.

EDIT: I realize that the return of my COM call actually results in a HRESULT. If this helps at all the first time it returns S_OK. Further iterations return what appear to be uninitialized values such as -2146233079