Are you sure your not turning spot-focussing mode off? My camera has choices of spot or other types of autofocus, and depending on what type of shot I'm taking I need it on spot-metering or other types for different things. First make sure this isn't what your turning on and off, since it is a common feature on Olympus cams.
Spot metering is for measuring light intensity. Instead of giving a general metering of the entire image, it gives the reading for a spot, generally the spot contained in the brackets, hole whatever at the center of your shot! It shouldn't have anything to do with focus at all!
Lee
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