hello everyone.I'm running into this problem. When I try to simulate a filter in multisim2001 power pro and use the OPAMP NE5532,there is error(no result),when I change the NE5532 for other OPAMP,the filter will work well.Anybody could tell me this is why?Is it a bug of multisim2001?The one who have installed multisim7 or multisim8 maybe need to make sure whether this problem be also existed.