Okay, this is a weird one, and I don't really expect anyone to have an answer, but no question is a stupid question. Right?
I use Light Room 5 to convert and edit my Canon RAW files and export them to "My Pictures". Now, when I shoot with my 1DMkIII and export them to that folder, I can arrange the files by month, or arrange by day. Excellent. Now, when I shoot with my 1DMkIIn, and export to that very same folder, and arrange by month or day, the images do NOT show up (at all). If I arrange by 'folder', then there they are. If I display the 1DMkIIn images in a list, with details, the date IS there.
Any ideas why this might be and what I can do about it? It's just an annoyance more than anything.