Has anyone had this problem? I use self wound bobbins on my George (L size) and have never had a problem until recently. When I put in a fresh bobbin, pull up the bobbin thread, put my practice sandwich under to check on tension as I always have. When I press the white one stitch button to bring up the bobbin thread, I pull on the bobbin thread and it seems to feed fine. So I start stitching, and on the first or on the second stitch, the thread on top thread seems to get totally tight, (hard to move the thread through the top tension disks by hand) the machine seizes up, slows down the abi