The issue I'm having with my MBA after 10.5.4 update is that intermittently the cursor becomes very jumpy, for example: when moving it from left side of the screen to the right, it jumps directly to the right. Very annoying. Since the issue is intermittent I don't think it has anything to do with mouse speed or anything. The issue can happen with both the trackpad and bluetooth mighty mouse. I'm running a MBA standard config with 10.5.4. Any ideas? Hmm, seems that the issue might be due to a core shutdowns... Is this what a core shutdown looks like?