I also bought a JVC DV Camcorder and it would download the movies to my new iMac DVSE but would not accept the export of the edited video. From what I have heard from others, the problem exists because of JVC, not Apple. From what I understand, JVC did not want to pay for the "Firewire" licensing from Apple so the standard is just different enough that it is not compatible with iMovie. I was lucky enough to find this out sooner rathter then later and quickly returned the JVC and got a Sony TRV-120 which I am very happy with.