1. Enable the Movie Render Queue and Apple ProRes and Avid DNx plugins, then restart
2. Create a simple scene with a camera animation
3. Add this job to the Movie Render Queue, go into the job settings and add Apple ProRes or AvidDNx outputs to the job.
4. Click the Output tab, and disable "Overwrite Existing Output"
6. Crashes at the end of the render.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-161040 in the post.