If its a 10spd setup, check that the spacers on the crank spindle are installed properly. I believe you have like a 2mm spacer on one side and a 3mm spacer on the other, or something to that effect. Long story short, many bikes come from the factory with two spacers installed on the drive side, but the crank must be removed and the beveled spacer moved to the non-drive side of the spindle as I recall. Not sure if thats for all Shimano 10spd triples or not, however.