I’ve noticed that when I highlight a section of text that covers a span of more than one line and then attempt to type over the highlighted section (essentially replacing it with the new text), the program will lock on me. I can shut the program down and reopen it and continue with my work.

Could you please give more details? I haven’t had any other reports of anything like this and I certainly can’t reproduce it myself, so any more information you could give would be much appreciated. For instance, are you in page view or not? Are you in Scrivenings mode, and if so, are you selecting across text boundaries (it just beep if you try to type over a selection spanning text boundaries)?