Found this in a Review of this camera.
Canon's flavour of MPEG-2 is editable natively by many professional NLEs, with the exception of Apple's Final Cut Studio, where it is handed by a provided Canon plug-in. This plug-in connects to Log and Transfer for transcoding (optional) and importing.
You do have this plug-in installed?
I have a canon xf 300 camcorder and my macbook pro with MAC OSX 10.7.5 will not recognize it, nor will FCP X 10.0.2. Is Pavtube MXF Video Converter for Mac the only answer I need or is it more complicated than just that.