When I go to my watched threads list and go to say, for example, page 4...then check some boxes and take an action, it does not return me to page 4, but the beginning of the list.
No, they were very old. And I don't think that matters. If I'm already viewing page 4, and then decide to unwatch some threads, it should bring me back to page 4 so I can pick up where I left off.