Ok folks, I got the $54 Brother sewing machine out of the box, got it threaded and made a couple stuff sacks out of $1/yd 1.9 ripstop. Yay! Ok, now I have a problem. I went to start sewing yet another stuff sack and can't get the thread from the lower bobbin to catch with the thread from above to make a complete stitch. WTF? There is thread on both sides, no tangles, my upper tension is set on 5. Am I doing something wrong? I playwed with this for about 30 mins before turning to youy guys. Any suggestions? Serenity now!!