Fantastic quilt! You did a wonderful job.
I have one Janome that doesn't like Gutterman thread. But I have 2 others that I have no problems with it.
I don't understand why the machine acts up, but I get nesting and irregular stitches, but if I put in another type of thread like C&C or Metzler, I have no problems.
I guess sewing machines are like people, they have their own preferences.