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Invalid window in DocumentComplete (DISPID_DOCUMENTCOMPLETE) in IE9 BHO

I am developing BHO and I am having problems handling events in IE9 . I process DocumentComplete (DISPID_DOCUMENTCOMPLETE) then I get IHTMLWindow2 and IHTMLLocation for future operations.

Code (simplified)

The BHO class uses

public IDispEventImpl<1, CBHO, &DIID_DWebBrowserEvents2, &LIBID_SHDocVw, 1, 0>,

Browser Event Consulting in SetSite

STDMETHODIMP CBHO::SetSite(IUnknown *punkSite)
{
    if(punkSite != NULL)
    {
        CComQIPtr<IServiceProvider> pServiceProvider = punkSite;
        pServiceProvider->QueryService(SID_SWebBrowserApp, IID_IWebBrowser2, (void**)&m_pWebBrowser);
        IDispEventImpl<1, CBHO, &DIID_DWebBrowserEvents2, &LIBID_SHDocVw, 1, 0>::DispEventAdvise(m_pWebBrowser);
    }
...
}

Shell Map

BEGIN_SINK_MAP(CBHO)
    SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_DOWNLOADCOMPLETE, OnDownloadComplete)
    SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_NAVIGATECOMPLETE2, OnNavigateComplete2)
    SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_ONQUIT, OnQuit)
    SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_WINDOWSTATECHANGED, OnWindowStateChanged)
    SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_PROPERTYCHANGE, OnPropertyChange)
    SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_BEFORENAVIGATE2, BeforeNavigate2)
    SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_DOCUMENTCOMPLETE, DocumentComplete)
END_SINK_MAP()

DocumentComplete event handler:

void _stdcall CBHO::DocumentComplete( IDispatch *pDisp, VARIANT *URL)
{
    CComQIPtr<IWebBrowser2> pBrowser(pDisp);
    CComPtr<IDispatch> pDispDoc;
    pBrowser->get_Document(&pDispDoc);
    CComQIPtr<IHTMLDocument2> pDoc(pDispDoc);;
    CComPtr<IHTMLWindow2> wnd;
    pDoc->get_parentWindow(&wnd);

    CComPtr<IHTMLLocation> pLoc;
    HRESULT hr = wnd->get_location(&pLoc);
    CComBSTR locHref; 
    hr=oLoc->get_href(&locHref);  //"Access denied" error here
}

In most cases, this works correctly, except for the link to open in a new tab (using middle click or links with target = "_blank"). In this case, with a new tab, I get a DocumentComplete event, and then I get a non-NULL wnd pointer to IHTMLWindow2 and IHTMLLocation, but when I try to do any operation on the pLoc pointer like get href or whatever, I get the error "Error access ", Also, when checking the doc.documentElement.outerHTML document, I got

<HTML><HEAD></HEAD>
<BODY>
<P>&nbsp;</P></BODY></HTML>

and that is not the content of the landing page.

At the same time, in IE10 this code works as expected.

Can anyone please advise where I am going wrong and why I am getting an invalid object in the DocumentComplete?

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