I've had to reinstall CF a couple of times since RC4.2 was released. After a day or two of use, it brings me to the Setup screen again and I have to reinstall to get things to work.
I'm not sure if this has been reported, but everytime I load my entire music library (about 1450 songs now), and restart the computer, most of the songs disappear from the playlist. The number of song still present in the list after a reboot varies between 50-250 songs.. It almost never resumes the actual song that was playing either.