iMovie doesn't recognize camera to import avchd
I'm a new convert to mac from PC. New MacBook Pro, bought two weeks ago. I successfully twice imported AVHCD videos from the SD card of my Sony camera, but my third try I can't get iMovie 11 to even recognze the camera or SD card.
The first two times, as soon as I put the SD card in the slot, iMovie opened and offered me the import option. This time, iPhoto opens automatically, but iMovie does not, and when I manually open iMovie and select "import from camera" it only offers me the FaceTime camera. I try to select a different camera, but facetime is the only option. As far as I can tell, I did nothing different, and I don't think I've changed any settings (honestly, I wouldn't know how).
I've deleted all of the still photos from the SD card, but I still get the iPhoto autoopen, and it hasn't fixed the problem. I've also tried shutting down/restarting, and connecting directly from the camera w/ a USB cable, but no joy. The SD card still has the "original file structure" as when it was shot.
The whole reason I spent the extra $1000 for a mac was because the video editing was supposed to be better and easier to use. I hung in there evern after discovering I can't use my last two years of stored AVCHD video anymore. But now I can't even use the new video I shot yesterday.
I am not a techie, but I gather that the answers sometimes have to do with the OS. I'm running OS X, v. 10.7.3, 2.4 GHz intel core i5.
Please help - at wit's end!
iMovie '11, Mac OS X (10.7.3)