Hi -
*If your camera shoots on tape, you must connect to the computer via a firewire cable* and use *Log and Capture*, not Log and Transfer.
The USB connection is provided to offload still images that are stored on the memory card of your camera, but cannot be used to connect for video offload.
If you are using Final Cut, then you do not need the Canon software to Log and Capture your footage.
Canon cameras are notorious for erratic behavior even with the correct firewire cable, be prepared for some experimentation, particularly if you have other firewire devices connected at the same time.
The correct firewire cable depends on what firewire port is available on your Mac. If it is a firewire 800 port, then you need a FW 9 pin to FW 4 pin cable. If your Mac has firewire 400, then you need a FW 6 pin to FW 4 pin cable.
The firewire port on the camera can be labeled Firewire, DV, iLink, HDV . . . so you may have to look around on the camera for it.
MtD