God damn it.
I'm gone for a week's vacation. There are 333 new messages in "General", and I figure I'll save going through the General forum for tomorrow. I'll go through some other forums tonight and do General sometime tomorrow.
But in another thread in another forum, there was a link to this thread. Since I had some new information to post about this subject, I replied to this thread.
I knew the thread was in General, but I thought that as long as I only hit reply to this one message without going up a level to the thread message list, it would leave all the other threads in General marked as unread. It did not. Now I have lost the unread marks for 333 messages in General. I don't know exactly where to pick up reading.
Sigh. Guess I'll have to brute-force it with date ranges.