Hi Tom. I guess I wasn't really asking specifically for help on my issues. I should have stopped after my first sentence: "Did this ever get resolved?" What followed was more like whining and complaining. But since you replied, I'll try to get serious.
I have not discerned a pattern to the crashes. Sometimes when I copy with the intention of pasting attributes, I will notice that it doesn't work. Control clicking to move to the destination clip will not update the viewer or the Inspector. I usually restart at that point. Sometimes this will happen every couple attempts and I am restarting every few minutes. Other times it will work for an hour. The "unexpectedly quit" events seem random to me. It's always during some kind of timeline editing. I know that's not very helpful. Of course, Apple receives the crash reports but not the restarts when things stop working or I get the spinning beachball.
I always optimize media at import. Original media is either from a Panny GH2 (AVCHD) or GH3 (MOV).
FCPX 10.0.7
MacBook Pro with Retina display, OS X Mountain Lion (10.8.2), 2.6 GHz i7, 16GB 1600 MHz DDR3
NVIDIA GeForce GT 650M 1024 MB
500GB internal SSD
2x LaCie 1TB Little Big Disk (Thunderbolt)
1x LaCie 2TB Little Big Disk (Thunderbolt)
BTW... I am using the family TV as a second monitor via HDMI.