Hey everyone. I am a novice woodworker and I recently purchased a craftsman jigsaw that got great reviews. I am using it to cut 3/4" mdf as I am trying to make radiator covers. I marked out my first cut, clamped a straightedge to the mdf so I could make a straight cut and began to cut using a woodcutting blade and a high speed setting. About six inches into the cut the blade started bending to the left and my cut went very crooked. I've since tried every possible combo of speed and blade action settings on test pieces and can't get it to cut a straight or perpendicular line. I've used jigsaws before and never had this problem. Could it be a cheap blade, bad jigsaw, cutting problems with mdf, or just my stupidity? Any help would be greatly appreciated.