I brooded about this all day and I am still puzzled. I had some issues earlier while trying to FMQ this quilt so I changed the needle (twice) adjusted the tension and tested on a scrap. The machine then worked just fine for more than 1/2 of the quilt. So last night when I started to finish it I sewed about 10" and flipped the quilt to see how it looked. It was fine so I went ahead and finished it off. Then when I flipped to the backing I found several areas full of loops. A bunch of loops then it would be fine...then more loops and more fine. What am I doing wrong?

Maybe your speed? Either the machines speed or your speed moving the quilt?

Too fast? or just that I change speed as I move the quilt or step on the pedal?

What kind of machine are you using?

Last night, I practiced free motion quilting....LOL at myself...it is not a pretty sight. But I am getting better. I think, but could be wrong, that the loops are formed when we are moving our fabric to quickly. Because, I have the same exact problem. Will be watching this to see what other, more experienced, quilters have to say.

It may be that you change directions too quickly or need to try "bobbin washers". They reduce the backlash of bobbins that make thread nests. http://www.keepsakequilting.com/productdetail/8248.htm

piney

Could it be needing to be dusted out. Too much lint or scraps in the works?

It's a BabyLock Quest Plus.

I clean frequently and used canned air.

Please please don't use canned air to clean your machine! First of all, there is a certain amount of moisture which you don't want inside your machine and secondly, it can actually force lint further inside. Use a vacumn instead.