Thanks for the tips. This is a machine that's new to me and I'm new to sewing, so that's not a great combo right off the bat! I messed around with the thread tension settings, but that didn't resolve the problem. I called around and found a local shop that actually used to sell these new and the guy knows these machines inside and out. I took it to him and he's going to go through it and get it tuned up and dialed in for me. After a quick inspection, he did say that overall, the machine is in excellent condition, so at least I didn't buy a lemon. I'm looking forward to getting it back and getting to work!