I am subscribed to CS 2015. Because I was frustrated trying to learn Lightroom, I fell back on uploading my photos into Bridge. When trying to open photos in Photoshop, the subject error message suddenly appeared on any of 43,000 files I have on a WD ext. hard drive. I have been using my subscription several months with no problems. A google search for others with same problem found several over the past few years and the replies seemed to boil down to "the files are corrupt" and no solutions given. I was quite distressed. Tried several more times with same error message. Today, I tried again and bingo - everything worked just fine. I am relieved but worried that it will happen again or that I did something to cause that error message. I am not a tech person so if anyone can give me some insight on this issue, I would be grateful. I have backup on another hard drive, but was afraid to open in CS2015 if the files were going to be corrupted.