My Pfaff loves gutterman! I usually can get any thread to work if I am patient or if I walk away and come back. Like someone said, try the vertical or even the other horizontal if you have an other one on your machine. Try a thread stand in all different positions. Try putting your thread in the freezer overnight, I learned about this years ago, it helps with embroidery threads that break frequently.
Also I prefer pre wound bobbins. I will only use other bobbins if such as in quilting the thread color is important.