Upgraded from Xtreme Toolkit pro 9.51 to 9.70 using it as an extension dll. No Changes in code. Program runs fine in XTP 9.51

Program gives assertion on exit in

XTPThemeManager.cpp line 261 in destructor of CXTThemeManager

 CXTThemeManager::~CXTThemeManager()
{
 POSITION pos = m_mapDefaultFactories.GetStartPosition();
 void* pThemeFactoryClass;
 CXTThemeManagerStyleFactory* pFactory = 0;
 while(pos)
 {
  m_mapDefaultFactories.GetNextAssoc(pos, pThemeFactoryClass, (void *&)pFactory);
  delete pFactory;
 }

 ASSERT(m_factoryList.m_pHead == 0); //Crash afterwards here 
 m_factoryList.RemoveAll();
}