Another things that bothers me a lot.
As per the title, when I open a thread the top navigation bar disappears and this means I need to do one extra click to continue browsing.
Use case: I fire up the forum and notice there are X unread messages and Y new messages. I start going through the unread. Once I’ve read a message and want to move on to the next, I need to click on the link at the top left of the page (the one that doesn’t work on the index page) and from there click again on the unread link and select which link I want to read next.
If the top bar was always visible (I really don’t understand why it isn’t), I would open a link on the unread list and once done with it click again on the unread list and read another thread.
I don’t see the point of making the top navigation disappear when we’re inside a thread. It decreases the usability of the forum and the tiny amount of screen real estate that is added doesn’t do much for me. Threads tend to be huge, scrolling is expected.