So I took the plunge and upgraded to OS X Leopard today. I wish I would have held off. It’s not that there are X11 bugs that keep me from moving my X11 apps onto my second monitor, there just seems to be quite a few UI issues in general. I’ve had issues with Parallels not always going to full screen mode on a second monitor and it is completely incapable of going into coherence mode on a second screen. I’ve also had issues with window focus. That is to say, I command-tab or click on a window and select it, but it does not gain focus and I can’t do anything inside the window. I can’t even close it. At that poitn, the only way to fix it is a force quit.
I’ve also had problems with expose AND the dock. As in, all of the sudden expose stopped working (no error messages or anything). At that same point, I could no longer view the dock, command-tab through windows, or anything like that. I tried to reboot the machine to fix it but it hung on shutdown and I had to cut the power to get it to turn on again.
Performance isn’t that great either. When I click on an application in the dock, it completely pauses everything for a few seconds.
I think the release was rushed out a little too soon. It looks like it has a lot of potential though. We’ll see how long it takes apple to patch all of this up.