Second evening of playing over two hours - and no crashes, no bugs and almost beyond belief - the map not loading bug has gone too! This is all from reducing the number of friends on Uplay to less than 40. Unless, of course, there was some patch that I did not read about which has fixed both these bugs - but I think it is just from reducing the number of friends. To think I spent over a month going through Ubisoft report only for them to say my ntdll.dll was corrupt - and then find it is such a simple fix after all...