A very few users have written to me over the past few months regarding an error that appears when using Join Together v5.1. The error is "The variable m is not defined. (-2753)". This will occur after QuickTime exports the final joined file. I'm trying to track down some of the reasons for this error. It occurs when Join Together is unable to successfully change the file type and creator of the final joined file. If you have seen this error, or have reported it in the past, would you mind letting me know some details: Does the error, indeed, occur after QT export? Is the final joined file very large--say, over two or three hours? I'd like to try and fix this soon and your help is appreciated.