I can't figure out what I'm doing wrong but when I switch from Single Shot to Servo mode then I lose the ability to Eye Detect? In Single Shot, it grabs the eye immediately but if I change no other setting except switch to Servo, Eye detect disappears. There is no little square around the eye? Switch back to Single shot and eye detect suddenly reappears? Anyone have any idea what I've got set wrong? I'm set to AF+Eye (the left most selection) with Eye detect enabled and set to people.