These are both professional camcorders, selling for over $3000 each, and you're working on a Mac Pro? Are you sure you want to try to edit this video with a $75 consumer program? You may do much better with a professional program like Premiere Pro.
That said, can you confirm that you're connecting to your computer via FireWire and that other Mac programs can access the camcorders over this connection?
You may also want to download a demo of Premiere Pro to see if it does what you need.