If the devs are interested, it seems like yesterday's changes completely broke the site for a user signed in through Opera.
Some examples:
If I sign in on the home page, I see my user name, but when I click My Posts I just get a refresh of the home page.
If I sign in from a thread, I get a page with nothing but an edit box--the thread disappears.
If I sign in from the home page, go to Forums, and click a thread in the Recent list, I see the thread but it appears as if I had never signed in (no user name or buttons, no edit box).