I have read several of the posts on this subject from other members. I have the same problem and found that the King Tut verragated threads have a thickness issue between the light and dark sections. I myself have a 24 inch Fusion and do all my own maintenance, so i know it isnt my machine. I finally started taking a closer look at the thread with a magnifying glass and found this interesting. So for you folks who think it is your machine i dont think that is the problem. I have have contacted Superior threads with my findings, so see what they come up with for an answer.