I used KingTut on a previous system w/o any problems. However..with my new system, I have said a few bad words! My dealer said two things that stuck with me...1. Some threads don't play well together. Time and experience will help with that...not that this will help TODAY, but take notes. Likely when you figure this out, it will have made a HUGE impression and you won't do THAT again! (ask me how I know!) 2. The bigger the weight gap between top and bobbin threads, the more problems you will have. You don't have to match your threads, but they should be close in weight. I think that was my problem with the King Tut. I didn't want to use it in the bobbin, so I tried SoFine. NOT...when I changed to a Star thread I had in my thread drawer, the problems pretty much vanished.
Take a deep breath...try a quilt sandwich till you are happy...maybe a glass of wine?? ::;wink:::