I can relate. Just last night I rethreaded my new Brother Innov'is machine and then couldn't get the presser foot to go down. The little screen kept reading: lower presser foot, and I kept trying, while talking loud to that screen! Then I realized the knee lift lever was jammed up against the side of the table. I freed it and what do you know? presser foot mechanism worked again! My only excuse is that it was late, I was tired, and I jumped to a negative conclusion, thinking "Oh no, this expensive machine, which I've had 5 months, is broken!"