Originally Posted by mtravellerh
Say, somehow I can't edit the TOC via TOC editor anymore? Did you change something in the handling?
Just tried it here, and it works as expected. Try to isolate the problem and create an issue on the tracker with the epub and steps necessary to reproduce.
But I didn't change anything in the TOC related to heading updates. All I did was make the TOC window remember its size and position across invocations.