You are currently working with your MP3 files and suddenly one file does not play anymore. This sounds familiar to you? Then we may have help for you: MP3 Repair Tool
MP3 files are very sensitive. Just a single modified byte can make the whole file unreadable for several MP3 players. Thus it's not hard that an accident or bug in a MP3 editor corrupts a file.
But this doesn't mean that the file is lost.
MP3 Repair Tool can help you!