On a PC with Win XP, I have a main folder in which there are about 60 pictures and another folder with pictures. I've created both folders, they are not system-preset like the My Documents folder. The pictures are mostly jpg, some jpeg, some png. I edit them for brightness/contrast and insert them into a Word file. Everything seemed to work fine until today, after I, in an effort to sort the pictures, chose the option that they be sorted by type of file in the "View - Arrange icons by" option. From then on, a mismatch is occurring: in the Windows Explorer window in thumbnail view, as well as in the filmstrip view, there is a mismatch between the thumbnail picture and the actual picture shown. Ie. I click on a thumbnail picture, and the picture that opens is another one. This mismatch is occurring only in some pictures, but not all. I couldn't figure out the pattern whether it happens only with those I edited or renamed, or not. Strangely, the files in the folder are supposed to show in alphabetical / numerical order, but they don't (ie. a file whose name begins with a 4 is before one that begins with a 2). What is going on? How can I fix this? Could this problem spread on other folders with pictures or other files? Thank you for your help.