Today I've learned that you don't mix your threads. Bet you all already knew that! I was quilting with my Juki/frame and was running low on thread...so, I decided to use some different thread same color (white) in the bobbin & use my better thread in the needle. Well, it was a mess & at first I thought that it was me, because I'm learning to quilt on a frame. Looked at the bobbin thread again & noticed that it is polyester & my needle thread is cotton. Went to the quilt store and bought more thread and the problem is solved. But, I've got a bunch of stitches to take out. I'm going to try to keep the quilt on the frame & roll it back to take out the stitches. Hope that works.