I'm starting out here in the broader "OS X Help" forum before diving into a specific sub-forum because I've got a few too many variables to try and eliminate from the equation, so here goes: I've been running Leopard since November on a mac pro (2x2.66, 2GB RAM, X1900 XT w/ 512MB - CTO direct from Apple). No issues beyond some initial .Mac sync weirdness with a Tiger machine and occasional graphics glitches like weird lines drawn through an app's window. Last week I added a 2TB LaCie drive and started using Time Machine. Again, no problems and things were running smoothly. This week I've been working on a Motion project and all of a sudden this rock solid machine is freaking out. Motion will typically crash on me after anywhere from 5 minutes to 2 hours leaving me with a an almost completely unresponsive system: I can still move my mouse pointer, but any attempt to bring up the force quit dialog box, or click in menus or the dock is futile. I'm stuck having to do a hard shutdown by pressing and holding the power button. Then, when I restart, I run into odd issues with Spotlight wanting to re-index my internal and external drives, usually resulting in another hard crash unless I unplug/turn off the external drive and boot into single user mode to run fsck first to clean up the boot drive before letting Spotlight do its thing. At this point, I've updated the firmware for the graphics card (in case those occasional graphic glitches are an indicator of something weird with the ATI card), and deleted and re-installed Motion, but I'm still having issues. Any advice for what to try next?