|Please check the following:
||Was the Start button red when you pressed it? If it was grey then nothing could happen. Please also read: Why is the start button greyed out?
||If you pressed the red start button and 1-4a Rename began to rename and then finished and you see the changed file names in the left column then the filenames HAVE been changed.
1-4a Rename re-reads the folder newly
as if it was for the first time. The newly created list is NOT a internally calculated list. It is read directly from the hard drive. Thus it is impossible that the files snap back, except when you have a backup program running in the background that automatically unchanges folder
||You have to make sure, that no file in the file list is being used/is opened by another program while the renaming is being done. If you opened this file and are working on it then renaming is not possible.
||As you may know, each file has 2 filenames. The first is the short DOS filename (8+3 = 8 character max for the fileNAME and 3 max for the fileEXTENSION) the second is the long one. Sometimes (I guess this is a Windows bug) renaming files from 8+3 to 8+3 just renames the short filename. Thus a workaround would be to append something like "@@@@@@@@" to the front of the filenames to make sure they are longer than 8 characters and then rename the way you want and then delete the @s.
||You have to make sure, that appropriate security options are set. If the folder is read-only, then 1-4a Rename cannot change anything.
||Did you press the Undo Button accidentally?
||Did you forget to press the "Start Button"? Sometimes people think the preview is the result already.
||Are the filenames too long? Windows has bad manners sometimes. It lets you rename a file to have 255+ characters but doesn't let you rename it back.
Microsoft's proposal for this issue:
Copy all files of you hard drive to another hard drive (except for this special file).
Format your hard drive.
Copy all files back.