Any solution to this? I'm experiencing a similar thing under Mavericks. Created a smart folder to find files larger than 100MB, but several I know exist (.mov files) are not showing up.
There's a caveat I'm trying to figure out though. My 500GB flash was just filled up, so I'm having to delete files. I'm wondering if since the drive was full, that the OS couldn't properly (re)index recent files that meet the smart folder criteria? We'll see. I do know that strange things happen when an OS drive is completely full. Any input is appreciated.