I reported this before somewhere, but APUG can be very slow. Still is the case.
Sometimes, nothing happens when you click on a link that should select a thread or post and open it in the browser. Sometimes, stopping he procedure and trying again will help. Sometimes not even that, and it's "come back and try again some time later" time.
I suspected that it had to do with the database, not being able to 'serve' a thread while someone is posting, or something of the sort.
Today (it happens very regularly) i got confirmation of that for the first time in the form and shape of a "Database error" page that was served instead of the thread i wanted to see, that (by the way) also mentioned the "technical staff" is alerted.