When I capture video from my DV camera to iMovieHD, there are rapid irregular audio dropouts. No problem with the video. Sounds like a loose connection, but can't be. This might have started when I upgraded to iMOvie HD--not sure. I've tried other firewire cables, two cameras, unloading all extra hardware, disks, and software on my Mac min os x, reloading iMovie. A window PC works OK capturing the same video from the same cameras. Any ideas?