So I have an Olympus FE-140 camera that suddenly is displaying old thumbnails over new pictures.
Hook camera to computer to download, old thumbs shown on screen. These are things deleted and thought to be gone after formatting the card. Click on old image and it appears on the screen for a minute, then is replaced by the new picture I just took...
Replaced the card and the same thing happened. Even stranger was the fact that the old picture shown was never taken with this card in the camera!
Remove card and use the cameras small internal storage and it seems to work fine.
Filled the card to its max (got full card message), deleted and formatted. Yup, old thumbs are back.
Throw out these cards and buy new?
Try reformatting the cards a few times.
If you formatting the xd card using the camera, I would try formating using a computer and a USB all-in-one card reader/write adapter.
After that, I would clear all images from the internal camera memory, pull the camera battery, then let it sit overnight (It shouldn't matter with flash memory, but it won't hurt to drain any residual charge).
Reinsert the battery and memory card and see what happens.
Cards are pretty much a consumable and depending on how old this one is and how many write cycles it has seen, it might well be time to throw it out.
I'd get another card and see if the behaviour persists, if it doesn't it's likely a problem with the card, if it does it's probably a camera issue, especially if the camera is trying to be clever when it comes to handling thumbnails.
Thumbnails are often stored as a separate file by some camera systems, sounds like the camera is not fully reformatting the card. I would format it on a computer or get a new card. Perhaps that section of the card is corrupt.
Any chance there's a bit of fluff or cat hair or something interfering with camera-to-card contact? Dunno how you'd go about cleaning out that little slot. A gentle blast of compressed air?