That stinks! I quilted a faux chanel blanket a week ago and had the samething happen.

looks like the top tention is too loose.

I.ve done same thing...............keep on trucking..dont look back

The only good thing is you caught it before you gave it... and with the tension so loose it will be easy to remove.

Have certainly got a lot of hints from this entry---especially to turn over my quilt periodically to be sure all is well on the underside.

This has happened to me too. My machine is going to slow and I am moving the quilt too fast.

I don't know if anyone else has had this problem and figured out like I did that it was indeed MY fault.
I discovered that when I am quilting, usually using my walking foot that I inadvertantly hit the tension knob when I am turning my quilts.
I had one that looked like this & I was very disappointed. Then noticed that my tension was WAY down. I have a sticky note on the front of my machine to remind me to check my tension frequently.

Happy Quilting, Susan

Ooh I agree that's tension and because of the long stitches it shouldn't take too long to remove but boy I know how frustrating that can be...been there and done that! ;) I have a little square from a practice sandwich I made that I keep by my sewing machine whenever I'm free motioning...just like I might check my tension for piecing evertime I start I will do a little practice squiggle on my scrap square just to make sure tension and everything is looking good. Gives me a little warm up too before I get started on my actual project. Good luck! ;)

Sometimes you need a new needle too.

Been there, done that....it is easy to remove, but it doesn't make you feel any better...so sorry....However, like you, I did learn an important lesson, check the back OFTEN.....Good luck and let us know how it turns out.