Upload & Sell: On
I had the same thing happen about 4 times between various cards.
Whenever I had a suspect, I would isolate the card. The chances of me having four bad cards is not very high.
I reformatted and used the cards on not "critical" jobs.
They performed just fine. So recently, a card that never did this, produced a similar file.
For shit and giggles I took the card, put it back into the reader, and instead of using LR to import, I start--->computer---->removable dEvices---->drive k: and manually drug the suspect file over. Opened it in bridge, and photoshop. Sure enough, file was absolutely fine.
So I went into computer--->pictures--->2011--->11-10-2011 and pulled the file that LR imported, and put it in bridge/ps. The Jpg preview was fine...the image in acr was not.
So I deleted the corrupt file from LR. Imported the file from my desktop...file is fine.
My guess is LR screwed the pooch, or my card reader is shitting the bed.