That credit crisis we've been hearing pretty much non-stop about for over a year hasn't gone anywhere, if a regulatory filing Monday afternoon by JP Morgan Chase & Co (JPM) is any indication. In a filing with the Securities and Exchange Commission, the investment banking giant said that it took a $1.5 billion writedown on its mortgage-backed positions in July alone. The writedown came as JP Morgan said that it "continues to be negatively affected by the disruption in the credit and mortgage markets, as well as by overall lower levels of liquidity and wider credit spreads," and warned that both banking fees and client activity in its investment bank would suffer if the trend continued throughout the quarter. The company held $19.5 billion of prime and Alt-A mortgage-backed exposure and $1.9 billion of subprime exposure at the end of the second quarter.