I noticed this for the first time just a few days ago.
The keyboard # command pops up a little dialog box, in which you can enter a desired post number, and it jumps directly to that post. This has stopped working. Now, no matter what post number you enter, it takes you to the first post in the thread.
More precisely: It takes you to the desire post, but only for a brief moment. Then the page appears to re-load itself, but leaves you at the top of the thread.