The euro zone crisis is not back --, at least not yet it isn't. Despite the great progress which has been made over the last few years, the latest bout of market tensions over Greece serve to illustrate the degree of uncertainty which still hangs over the future of monetary union - will a so-called Grexit scenario will finally occur? Certainly the most notable feature of the current Greece crisis is the way in which bond yields in the other Euro periphery countries have continued to head downwards, leading many to conclude that the "contagion" threat is now a thing of the past. But doubts...