New status. the problem occurs when I update anything on the Category or Forum summary pages.
If I go into the Forum Pages and select Details I can change the title of the forum and enable it, even assign it to a different category and all the post are there for it. (I haven't checked them all, but I will.) Currently, I have them all in categories that only Admin can view.
I'm letting them sit there until I can be assured the problem will not mirgate to 7.3. Don't know how that's going to happen but ......