If you only read one sentence in this post, let it be this one:
We’ve been going through our crash reporter information lately, and we’ve noticed many instances of crashes that shouldn’t be happening if folks were running with the most recent updates to Element 3D and After Effects. So, please install those updates, and let us know with a bug report if you continue to have problems.
When we talked with Sérgio and Andrew at VideoCopilot about the crashes that we were seeing in these reports, they also mentioned that many of them indicated that folks were trying to run Element 3D with settings higher than their card can handle or with overly complex scenes. They recommend that everyone read these suggestions about how to avoid such problems, as well as making sure that your computer meets the specifications for Element 3D. They have some good troubleshooting information here, too.
There are also some caching fixes for both Element 3D and for After Effects in general in the updates for Element 3D and updates for After Effects, which address problems with stale frames being stored and retrieved from the cache.