Hmmmmm. I have the same machine, just bought it in October. I really like the pfaff qe4, the extra space is wonderful and the features are great. I had this same problem with a Christmas quilt I was working on. Don't know what I did wrong........ I ripped the mess out, took a deep breath, drank heavily (not really) put it away for the night and started the next day. maybe the feed dogs aren't down all the way, re thread the machine and check the bobbin.