I'm a registered user and have been having problems with the Tivo output and its metadata. I think it might have something to do with Tivo's 7.2.2 update but I'm not sure. Anyway, editing the file in VideoReDo and then trying to send it back to Tivo leads to errors in Tivo saying it doesn't recognize the file format. BUT - if I save the file to MPEG format, use TivoAttach to extract the header from the original file and then attach that header to my newly created MPEG Tivo accepts it completely. I'm using the latest betas (465 - doesn't look like 466 would fix it) FYI.