Hi vagrantart -
I think that this might be related to a GUID duplication happen in the project, can you post a copy of your project logs here, you are not sharing them via Crash reporter.
I also think that this might be corrected in 4.11, so if you can make a copy of your project and try to open it in 4.11 Preview to test to see if the crash still occurs. If it does please make sure to submit the crash and if not let us know as well.
Finally, I am attempting to generate a sample project which replicates the crash, but if you can give me any additional information about your project setup and specifically your Foliage setup or if you are able to replicate the conditions in a sample project and get the crash you can post that here.
Thank You
Eric Ketchum