Leah, did you get figured out what was causing problems? I know how frustrating this can be, so know we're all there for you! on my old Gammill this problem is 9 x out of 10 because top thread is jumping out of the intermediate tension discs. When I changed the way I thread it (video on Gammill's website ) where I but the looped thread end thru the guide and around the tensioner and then over the bobbin count wheel so basically can not jump out. I had this problem with the first time I used Glide and swore it meant I couldn't use Glide---glad I figured it out. I've also found that sometimes just a complete detailed cleaning and oiling makes everything work. Keep us posted!