this problem seems to be x64 specific, cause "DocumentLoader.cxx" compiled 
with LO 5.4.6 x86 SDK will work with a listening LO 5.4.6 x86.

steps to reproduce:
- compile "SDK Example DocumentLoader.cxx"
  https://api.libreoffice.org/examples/cpp/DocumentLoader/
  i used LO x64 SDK and VS 2015 (c/c++ options: /D "WIN32" /D "WNT"
  /D "CPPU_ENV=mscx"), link with: /MACHINE:X64

- start LO x64 in listening mode, e.g.
  "C:\Program Files\LibreOffice\program\soffice.exe"
  --accept=socket,host=localhost,port=8100;urp;StarOffice.ServiceManager

- start "DocumentLoader.exe" - it will connect but crash at:
  Reference < XDesktop2 > xComponentLoader = Desktop::create(xComponentContext);

  Ausnahme ausgelöst bei 0x00007FFFED91EA70 (mscx_uno.dll) in
  DocumentLoader.exe: 0xC0000005: Zugriffsverletzung beim Lesen an 
  Position 0x0000000000000008.

  // Reference.hxx
  inline XInterface * BaseReference::iquery(
    XInterface * pInterface, const Type & rType )
  {
    if (pInterface)
    {
        Any aRet( pInterface->queryInterface( rType ) );
        // Exception   
        if (typelib_TypeClass_INTERFACE == aRet.pType->eTypeClass)
        {
            XInterface * pRet = static_cast< XInterface * >( aRet.pReserved );
            aRet.pReserved = NULL;
            return pRet;
        }
    }
    return NULL;
}

btw: i have another example, that will connect, load a document but crash 
with same exception as soon as i try to get XModel from 

xComponent = xComponentLoader->loadComponentFromURL(sAbsoluteDocUrl,
              OUString(RTL_CONSTASCII_USTRINGPARAM("_blank")), 0, props);
if (xComponent.is()) {
// Exception
 Reference < com::sun::star::frame::XModel > xModel(xComponent, UNO_QUERY);
}