When I first got the Droid I did a test with a few videos and transferred them to my computer following the instructions. No problems. Just got back from Disney World after taking a bunch of videos and it won't let me transfer to my computer. While in Gallery after clicking on "Mount" the screen says "No media found". All these videos and photos are viewable on the phone but once connected by the USB cable to the computer and following the transfer instructions nothing is there.
I spoke with tech support at Motorola and they couldn't figure it out.