activex plugin causes claim destroy concentration exit vs2008

my mfc concentration controlling "esri mapobjects lt2" activex plugin throws an claim during me shutting it.
the blunder occurs cmdtarg.cpp:

ccmdtarget::~ccmdtarget()
{
#ifndef _afx_no_ole_support
    (m_xdispatch.m_vtbl != 0)
        ((coledispatchimpl*)&m_xdispatch)->disconnect();
    assert(m_dwref <= 1); //<--- fails since m_dwref 3
#endif
    m_pmodulestate = null;
}

i built (native c++) concentration vc9.
when i accumulate concentration vc6, behaves nicely.

what reason this?