Actually, I haven't seen it turn either blue nor red, it always remains white? Anyway this jittering thing happened only for this one subject with the book, where the focus box starts dancing around. Maybe this is actually the problem of the face recognition not working, and it thinks the objects on the book cover are faces. I'm attaching the picture, hope this works. Btw latest fixes work great! One more question: why is there no 8Mpx mode?