Unable to import photos into Lightroom 3.5 from memory card all of a sudden. I was able to copy them into another computer's LR. Tried memory from 3 different cameras. Computer has been off and on many times. I discovered: the images open in Bridge and then open in PS. The images show in LR but when I click import, they get the "could not be read" message. The ODD thing is: when I go back to bridge they have disappeared - and in the computer the whole icon for SD card has vanished. If I then remove the SD card and re-insert, it will appear in Computer as SD icon and will be fine until I put it in LR.