I am using whatever theme was presented as standard a few days ago when things changed. I can see no option for different themes.

What about genuinely useful things that no longer work such as-
Quote Originally Posted by Wirralian View Post
Clicking on a post takes you to first post in a thread, with no option for the most recent. Not too helpful in a thread with over a thousand posts.

Keyboard options of Ctrl-click and Shft-click have been disabled. Why? It's really useful.