Julie,
I have a Juki also...what thread do you use to do your quilting? I'm still practicing FMQ and have lately had some issues with the bobbin thread on the back. Didn't have this before. Know this is usually a tension issue and wonder if it is the thread I am using now. Oh me, don't know if I'll ever get a whole regular size quilt done in FMQ. Sure have done a bunch of practicing though. LOL
Brenda