Making a rag baby quilt for a baby shower today and could not get my machine to sew properly. The bottom thread would not connect with the top thread. Tried everything, took out the bobbin about 6 times, rethreaded the top over and over, no luck. Just about decided I would have to take the machine in for repair and I realized I had forgot to put the presser foot on to my walking foot. Duh !! ( I have a viking with a walking foot that has several different feet ) Really felt stupid and wasted over an hour trying to sew before I figured it out.