I have been syncing my iPhone 4 recently and it was updating and adding the "faces" column in my photo roll. For some reason, I got a weird error yesterday (iPhone could not be synced - required file not found). The error is gone now, but now the faces section in the photo roll is gone. I use my MBP with iPhoto to organize my photos and it's been syncing fine, up until yesterday. I did a restore on the iPhone, rebooted it and the MBP and so far no luck. Has anyone else seen this or know of a fix or at least a likely cause? Thanks!