This might be a silly question but .... after opening a thread and reading all of the postings on it is the only way to get back to the same forum, to open the next posting, is by using the back arrow button ?
Directly under the buttons and above the section that says "Welcome, your name....", are additional forum navigation links displaying the section structure. BPN Forums link takes you to the initial forum list and so on.... Not as visible but it's another option for now. At the end of each thread are the 'Previous Thread | Next Thread' links.