1. I've had trouble dismounting disk images. When I restart they disappear. Eventually it happens again. (Right now they dismount fine.) 2. System Prefs crashes when ever I select a select one of my own image folders in the Screen Saver tab. 3. The download stack (when it's viewed as a grid) kills the dock after a few seconds. Any ideas what's behind this? For what it's worth... I've networked (AFP) my to Mac together a few days ago, and I installed 4GB of memory yesterday (which passed a test using Rember). The problem with the .dmg files happened before I installed the memory so I don't think it is that. Two other issue, which now seem fine, was that my wallpaper would default to the standard Leopard wallpaper after a restart along with Time Machine appearing in the dock at the right of the app end even though I don't keep it there.