Check to see if the top thread is wrapped around the thread spool up on top. That can happen, and will seriously retard the feeding of the thread.

Thank you everyone for your suggestions will try them and post the resolution, once all the unquilting is done.

You might also start with a newly threaded bobbin. Did you by chance use a different spool of thread for the bobbin than you have for the top? I've had this happen to me a couple of times and I started with a new bobin and it actually worked. Don't ask why I don't know, but I had rethreaded and everything, then changed bobbins and BINGO. Like someone else said at least the ripping out will be quite easy. Good luck. Let us know, how things come out.

Looks like a tension problem, even if you did not change anything. Perhaps the lint has built - up whilst you have been busily quilting. If you have furry cotton, it will do this. Give everything a thorough clean and check there is no lint in the tension discs or stuck in the bobbin race, and take off the plate and dust in there too. Then re - thread your machine and make sure the bobbin is in correctly. Hope you have better luck after that. I once had a problem of knotting underneath, and it was the actual bobbin that was not completely circular. Threw it out and had no problem with the other bobbins.

Looks like a threading problem.That is what mine was anyway.Also clean the bobbin area.

I took my machine to the shop twice to find that it was the brand of thread I was using. good luck

re thread top and bottom

this happened to me on my hobby short arm quilting machine, had the repair man make a house call, it was the tension and he took the sewing machine with him. The tension control is right next to the button for the needle to go up or down, when I'm bring the thread up. I was quilting and then after I roll the quilt I saw the same thing as you!!!

Make sure when you thread your machine, the presser foot is UP. I would tighten the tension on the top and re thread.

Yea, all of the above and try those teflon washers I keep harping about....The thread spider webs can make you crazy can't it?