I guess I need to pay more attention to exactly how my thread is behaving. I have a variety of differnt thread, Gutterman, Mettler, C&C, Superior (which I haven't tried yet), Sulky, Robison-anton (haven't tried yet), Dual Duty, Aurifil (didn't know I had any until I just checked!) and a host of others that are quite old. I buy it when I see it on sale. The only thing I have noticed about thread is that my Janome doesn't like different thread top and bottom. Other than that ... I need to pay more attention.
Will definately start paying more attention to the thread I use.