I have a 6600 and make sure your fabric is really close to the needle. If not, your 1st stitch could get stuck, because you probably are using the reg. face plate that is for zig zag or embriodery stitches. I've purchased a single hole plate for my machine and don't have problems when piecing. Even when I use my reg. face plate I'm not having problems, just make sure the fabric is really close to the needle before stitching.