i have been working with LR this past week and suddenly I show missing photos for many of this weeks shots. I am running disk error checking at the moment, but a search for the missing files on my drive came up empty. Feeling sorry for myself so thought I would ask here for any thoughts.
BTW, system file restore for some reason had not been setup to create restore points.
Have you ever moved or renamed images outside Lightroom?
Also check hard disk for bad sectors.