I have a Janome 6260QC, and I have to use Gutermann thread or 100% cotton thread. I had many old spools of Coats and Clark and it never gave me a problem but when I started buying new spools it did not take kindly to them. This is my first post. I have been sewing for 40plus years. We now live in the Missouri Ozarks but came here from North Dakota. Joan