Originally Posted by nhweaver

I would first change the thread. It seems that the new machines only like the high quality thread *like aurifil*, or first make sure the top thread is exactly the same as the bobbin thread. If that doesn't work, bring the machine back. If you charged it, you can get a copy of the bill. My new Viking 875Q is so picky about thread, but my 11 years old Janome 10000 will use anything.