Where to start troubleshooting

[Rob Lewis]

After being basically trouble-free for a long time, XTension has recently taken to freezing after running for a while. I get the "not responding" message and have to force-quit it. 

I haven't paid much attention to my system in a while (as I said, it's been trouble-free), so I'm not sure when this started—it seems like maybe a couple or three builds ago. 

What's the best way to start looking for the cause of this? Is there liable to be anything in crash logs?