I use Logic 7 Express. Since I upgraded to OS 10.4.2 it started crashing on a daily basis: when opening the program the screen comes down that says "You must restart your computer" in every language and I need to do a hard reset. I posted about my problems on these forums and someone said that it was a common problem that could be fixed with an upgrade to 7.1 so I bought the disk and did the upgrade. The problem is still exactly the same. I am not using any imcompatible Audio Units. My machine is a Power Mac G5 1.6ghz that is kept in perfect condition with regular maintenance: I did not spend hundreds (thousands) of dollars just to have an audio setup that crashes half the time. If you have any suggestions or a similar experience please post.