I can still see my folders, which have what I expect to see but over a few days hundreds of pictures have appeared. Some of them are simple system graphics (like stop buttons), some appear to have come from Evernote and some just aren't familiar. I can't see them in the file system and they also appear when I use such apps as Quickpic. I am running Android 4.3. The main recent changes are that I moved my music and pictures to my SD card - which appeared to have worked OK and I have replaced my battery with Zerolemon extended battery, which shouldn't affect this sort of thing.