It is simple to reproduce:
Add audio WITH SUBTITLES to your matinee and scroll timeline to this audio. When timeline enters it, editor crashes.
Hey JaroMast,
Thank you for taking the time to report this issue. With the information you provided I was able to get the crash to appear on my end. I have gone ahead and entered a bug report for the issue UE-16908. Let us know if you have anymore questions or need further assistance.
Thanks,