Qe4 and the little lip in front of the bobbin that turns are seam edges. Placing a 3/4 inch wide piece of masking tape over that lip allows the seams to glide right over without turning. I'd been battling that and read the tip somewhere about a month ago but never tried until reading about the problem in this thread today - it does work. I wouldn't use any kind of tape that is really sticky. Mine is the paper masking tape you use for painting and it comes off very easily. I'm stopping for the night and removed it just in case as I don't want any residue build up if I can avoid it. Just thought I'd share.
Thank you for starting this thread. I've bookmarked and have enjoyed reading it and learning which is a good thing.