I also have a Karma and have never noticed any lockup issues. I would suggest finding a windows box to install the software on as it does auto updating to the Karma via web updates which upgrade not only the firmware but also the java client and windows client. I do have to say I love my Karma, I got it because my new car had a jack for an aux. device and I was tired of carrying CDs. So far it has made a trip to Europe and several thousand miles in my car, with an average battery life of 10-12 hours(a little less than advertised but oh well). Again I must say I love the Karma(and I bought it before the recent price drop, big boohoo) and have recommended it to friends

I'd rather grab Alan Cox's testicles.
Mmmmm, big purple hairy nuts.....