I think Quik won't work on 10. 8. 5. Srarts at 10. 10 something. I am using quicktime. I have reformatted the card and I can now download and view the files but I am concerned that the problem of judder may return when I make longer films. To get round this before I used Mpeg Streamclip. I am also concerned that changing quite basi settings such as white balance and frame rate may have caused the problem and I do want to use these controls mostly to reduce the file size. But I am glad I can see my films now. Thanks for your reply.