If you select 'upvoted posts' and try to go to page 2, you'll get a 404.

Bug #590374:
When you are in, replying to a thread. If you scroll down to the previous code, the (Toggle Plain Text) doesn't work. Clicking on it will jump to the open message box. It makes it very hard to copy and paste clean (without #) simple portion of posted code.

Nick: Thank you, fixed :)
Aia: Aware of this and already on todo list