September has been a cruel month for risky assets, although bonds continue to defy gravity. As uncertainty rises on a number of fronts, risk aversion has taken on a life of its own… again. But the search for a safe haven has narrowed recently to U.S. fixed income, Treasuries in particular. The greenback is popular once more, advancing in excess of 6% over the last month, based on the U.S. Dollar Index. The world’s reserve currency comes with a fair amount of baggage these days, but for the moment the buck is still considered the safest, or at least the safer paper port in a storm. It’s no trivial detail that the rising appetite for dollars comes at a time of heightened fears for the euro’s survival. It all adds up to crumbling prices for foreign bonds in broad terms for both developed- and emerging-market nations when measured in dollar terms. Here’s a closer look at how the bloodletting has been unfolding in the major asset classes via our usual list of ETF proxies…