I was having problems with embroidery threads breaking contantly, and I was told to put the thread in the freezer for at least 24 hours. Threads lose moisture and that's why mine were breaking. You might want to throw the spool in the freezer and when you let it defrost,give it a try, it might work. And there is nothing wrong with C&C threads. they are a reputable company. Don't let the thread snobs get you down. In my opinion, for the price of new sewing machines, I think the machines should sew with any brand of thread. It's funny, my Mom's old White FR treadle sewing machine never balked at any thread Mom used. I think some of the new machines are way too fussy.