Just installed YARPP for the first time (after frustration with LinkWithin's lack of placement control, note: there is none, it's built into externally hosted script).
Funny thing, I have to disable Discuss comments system in order to access YARPP's admin page. If i don't it hangs connecting to Disqus. The admin page flashes for a second, then it goes white while trying to connect to Disqus. ...Disabling Disqus temporarily seems to be a work around.