Well, I've had more problems with Leopard in two weeks than I've had with any other version of OS X over four years. Leopard is very unstable on my iMac C2D 2.16Ghz (the last white iMac). Expose is very buggy, it simply won't select the highlighted window, the highlight will jump from one window to another and dance around. Very annoying, this feature has seemed to go down hill since intro in 10.3. In 10.4 we got lower resolution window renders and now it just doesn't work for me. It doesn't happen every time but it has happened at least 10 times. I also have more apps just locking up, going no where. And I'm talking about iLife apps, Safari, and Activity Monitor! I've had AM refuse to launch when other apps are misbehaving. Again, I'm not running anything crazy, maybe Transmit and Taco HTML. Force Quit doesn't do much at all when these apps go to no man's land. Mounting disk images has also caused problems, they just take forever. Anyone else have these issues?