To those who upgraded to El Capitan, the main issue for me seems to be that it crashes whenever using any of the tools that manipulate the in and out point (slip, slide, roll, etc.) So for other pioneers of new operating systems, beware! The blade tool is your friend.
Curiously, this same issue comes up on my Yosemite system, except only when slipping. And not nearly as often, but the issue was there. Anyone else having this trouble?