将HWND传递给DLL后断言失败

Question

在我们的应用程序中，我们在DLL中有专门的模块，可以控制主应用程序窗口中的窗口。我们将窗口作为HWND传递，而不是CWnd*。在DLL内部，我使用CWnd::FromHandle来获取CWnd *，我用它作为父窗口在该窗口内创建CHtmlView。

只要显示此视图，就会在wincore.cpp中发生调试声明：

    if(pMap)
    {
        ASSERT( (p = pMap->LookupPermanent(m_hWnd)) != NULL ||
                (p = pMap->LookupTemporary(m_hWnd)) != NULL);
    }
    ASSERT((CWnd*)p == this);   // must be us

    // Note: if either of the above asserts fire and you are
    // writing a multithreaded application, it is likely that
    // you have passed a C++ object from one thread to another
    // and have used that object in a way that was not intended.
    // (only simple inline wrapper functions should be used)
    //
    // In general, CWnd objects should be passed by HWND from
    // one thread to another.  The receiving thread can wrap
    // the HWND with a CWnd object by using CWnd::FromHandle.
    //
    // It is dangerous to pass C++ objects from one thread to
    // another, unless the objects are designed to be used in
    // such a manner.

这里与LookupTemporary的行失败了，尽管我完全按照评论中的描述使用它。在发布模式下，或者如果我只在我的视图类中放置一个空AssertValid - 方法，一切正常。

我的问题：这怎么可能发生，这是我应该关心的事情吗？