My Panasonic didn't work either...
I just received a Panasonic SDR-T50. I'm glad I found this forum because I ran into the same problem. According to the info before I purchased it appeared the cam would work with my mac. However, it does not, unless I go through the steps outlined here.
I tried it on my pc based laptop and the software that comes with it wouldn't load on WindowsXP. Upon further review, the box the camera comes in even states the it may not work with Windows although it is a Windows only program.
I have a cheaper Sanyo that works wonderfully with my mac. So I think I'll return this and stick to the Sanyo.