>>I am getting the message "Illegal Seek Offset" in one of my programs. I do not actually know where the problem is in my program because there is no line of code hilighted when I get the error message. The status bar shows the open dbf in area A, which was actually opened in a previous program. Why?
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>Most likely a corrupt index.

The other possibility that I have seen for this is that the app is on the server and connectivity is being lost for a short period of time. VFP will give that error when it can't read the app (which as you know is really just another table). Also even if the indexes are fine, if connection to the drive containing the database/table is interupted momentarily it will give that error. It means that the byte offset it is trying ti find is being returned as being invalid for the file in question.