Repeatedly, with image after image, after I have uploaded and edited an image in lightroom 5, when I return to the program I am unable to access the image. I am told simply 'file access was denied--no explanation, no apparent recourse except to rescan the image and upload again. But it is likely to happen again. I am scanning negatives using Silverfast 8 and Windows 7 64 bit pro. This seems to have begun about a month ago; I have been running Lightroom 5 and Silverfast more than a year. Currently I seem to be running 5.7. Can anyone advise?