These stitch problems have been plaguing me for weeks and I finally confirmed what the culprit was. (The first two lines on the left are great, the other lines to the right have tension issues.) I can't use Aurifil 2314 50/2 thread in my bobbin, for some reason it causes skipped and loose stitches. It doesn't matter how I adjust my tension settings, or if I change the needle type, I won't get normal stitches until I change to another thread in my bobbin case. Has anyone else experienced this?