I am getting the following exception in the release build of my assembly.

{"Attempted to read or write protected memory. This is often an
indication that other memory is corrupt."}    System.Exception
{System.AccessViolationException}

I do not have any problems in debug.  The problem occurs while
instantiating an unmanaged class.

Any idea what is causing the problem?   Why would I get the problem in
release but not debug?

I have included the wrapper managed class below. The unmanaged class
GarXface4::UsbDeviceNameList enumerates USB devices using functions
found in Setupapi.  The class works fine when called with unmanaged code.

public ref class UsbNames
{
public:
    UsbNames()
    {
        m_pLst = new GarXface4::UsbDeviceNameList();
    }

    ~UsbNames()
    {
               
        delete m_pLst;
    }

private:

    GarXface4::UsbDeviceNameList *m_pLst;
};