Risk appetite is being challenged in a choppy session as important market gauges paint a somewhat confusing picture for investors. U.S. and European equities are flat as traders struggle to justify pushing stocks further ahead following their recent good run and desks absorb some mixed U.S. home sales and factory data. Two-year Treasury yields have hit a record low, touching 0.40%, as concerns about U.S. growth leaves many investors convinced that the Federal Reserve will provide more monetary stimuli. Meanwhile the dollar, of late the market’s favorite inverse proxy for risk appetite, is bouncing firmly of recent eight-month lows.