On edit, I see... I changed something in the scripts, it worked fine for me. I probably overlooked something. I'll fix it right away.
EDIT: Fixed. It was something like a typo.
What I changed: If the last post in a thread is edited, they forum is supposed to mark it as unread. There was a small issue though. Sometimes it would mark a post as unread even though the post wasn't the last post in the thread. It took me a few hours (and I realized how horribly scripted the forum's engine is), but I was able to solve the issue after many trial and errors. Sadly I was not able to solve the issue that a thread would be marked as unread even for the editor of the last post when using the Java edit. The problem is that I couldn't figure out where the editor's member ID is store since it obviously wasn't stored in the variable where it was supposed to be. :/