I was almost done with quilting the QDAD challenge piece when I spotted it. A split seam.
Where did that come from??? There's plenty of fabric. I'm still not sure...the thread that was in the blue came out very easily, but was still in well before the picture. It's as though the thread in the white part disappeared.
But, I needed to fix it. I used some MonoPoly and tacked it down. It's there if you know what to look for, but isn't too bad.