In one month, U.S. stock funds went from hot to not. After making impressive returns in January, domestic equity funds last month tracked by Standard & Poor's could not budge up, with the best performer being large-cap value, inching +0.15% and the only style in positive territory for the month. That is a stunning turnaround from the first month of the year when some returns were almost stratospheric, with the best, small cap growth, topping 8%. The S&P blames the poor performance in February on high energy prices, oil-related geopolitical tensions in Iran and Nigeria and investor concern about the direction of the Federal Reserve Board with Ben Bernanke at the helm. Sam Stovall of Standard & Poor's, however, says investors shouldn't despair, as February is traditionally a cruel, cool month, and not necessarily an indicator of things to come.