A *cough* "friend' of mines computer had a load of *cough* "pre-release" Apple *cough* stuff on it and he told me that it stopped those apps working.. Poor guy!
It also did nothing for my G5 which still boots up 3 times out of 5 at max processor speeds because the SystemUIserver is trying to solve all the worlds folding@home / SETI@home and cancer algorithms, or something all at the same time! I swear to God one of these days the top of one of my processors is going to ping off!!