Join Together has been updated to v5.1.2. A couple of months ago I started getting reports from Join Together users regarding a strange "-54 file open" error. This error occurred as Join Together was attempting to apply tags to the joined file in iTunes. Turns out that iTunes 7.1.x is busy analyzing audio data during the "add" routine, thus leaving the file open and preventing the tags from being applied. I couldn't duplicate the error myself (still don't know why), so I had to rely on the kindness and patience of a good dozen or so users to fix the problem. Looks like it's licked. Also, the "-2753 variable" error that some people were getting has also been fixed. This was another error that I was unable to duplicate, so, once again, many thanks to the beta testers for their patient assistance.