okay, i just got my "new" sewing machine...it sewed just fine for a while, till i broke the needle. i replaced it with a brand new needle, and since then it has been skipping stitches like crazy. i tried two other needles, of different sizes and brands, and also tried different thread and rethreading the machine, and switching back to the original bobbin that came with the machine. i'm going crazy!
oh, i also tried different fabrics and fabric thicknesses and changing the tension.
needle in backwards? I've had that problem before with machines that let you put the needle in any way you want and it causes it to skip stitches