Sorry I could not be of more help, Lois
. I just FMQ'd two ten inch squares with my wavy King Tut and used the same thread in the bobbin to see what would happen and experienced no breakage. Of course, my King Tut was a #910 Bulrushes, a completely different color, therefore, a different lot than yours--so, if the thread is indeed the problem, my little experiment is irrelevant to your problem. I will be very interested in what Bob has to say because I have had a couple of "wavy" reels already so breakage might just be a matter of time for me... Up until now, when I have experienced thread breakage, after going through the TNT (thread, needle, tension) mantra, I have switched from a topstitch needle to a universal needle, usually with good results. In the meantime, I am really happy that your new reel of King Tut is working for you. Have a great (it's sunny!) weekend with your family!
Renata