500 luftballoons

[Inquisitive Raven]

It's the text input field at the bottom.  It's active the moment the page loads and anytime you hit PgUp, PgDn, or the arrow keys it cause the page to jump all the way down until the cursor is visible in the field.

This looks suspiciously like what's happening when I click the "go to first unread" link on a thread. It seems to load the page, pause on the first unread message for a couple of seconds then jump to the bottom of the page although it does end up on the last post  and not the reply box.