I'm embarrassed to tell you that today I couldn't figure out for the longest time why my Janome 12000 wouldn't let me move the needle over to the right. Grrrr!
Finally I realized that I had forgotten to change the needle plate from the embroidery one to the regular sewing one (I've been using it mostly for embroidery), so that it wouldn't let me go to the right and break a needle. Once I changed it, everything worked like it was supposed to. I really felt stupid.