Hi all, I'm new to quilting and started with a brother BB370 and quickly returned it for a brother CS-6000i, which was such an improvement. Midway through quilting my first wall hanging (it was the beginning project at my LQS), I started having problems with the tension. I finally read on line that it could be caused by fuzz and dust in the bobbin. After cleaning it out, it worked perfectly until tonight. Since the first cleaning, I've only made a couple potholders and "played" with making a pineapple block. So, tonight I cleaned the bobbin area again, but there was no fuzz or dust and I still can't correct the tension. Has anyone else had this problem? As a last straw, I can still return it to the store since I've only had it around 4 weeks....but really don't want to.