I had the same thing happen. I have a HVX200 that won’t show up in the Log and Transfer. I also have a Panasonic HDC-SD1 for my wife’s use that I tried to make work today and it is doing the same thing. I also, have searched and searched for people who are having problems with Log and Transfer but it seems everyone else’s problem is that they don’t know to use Log and Transfer.
I noticed the problem around the same time as Stuart. That makes me wonder if there was an update to something that screwed me up. It was flawless before. As a note I can still use iMovie to import the footage.
I caught a thread on mac forums about someone who thought Perian had something to do with it so I trashed it and am still were I started. I trashed final cut system prefs, nothing. I tried copying the cards to an internal HD and still nothing.
Another thing I am noting is that it seems like Final Cut is taking longer to shutdown.