Hi all, at this moment I work with FCP 6.0.4 , and the solution for me when preview disabled appears is quit FCP shut down the mac and, before to turn on again , first connect the camera FIRE WIRE, turn on the camera and then turn on the mac , when mac and the camera is on I turn on the external HD fire wire 800 and 400, open FCP and I can remote and operate the camera with log and capture, I think that the problem is the order to connect and turn on , when FIREWIRE devices is present. Whit FCP 6.0.4 and sistem 10.4.11 / 10.5.5 and quicktime 7.5.5 the problem is fixed in 80% .