Well, I just checked iTunes Store on my office Mac and now episode 9 is there. Strange.
Edit: Crap. Episode 9 was there when I wasn't logged in. Now that I've logged in, it's missing. WTF???
Edit 2: OK, I just did a search for "Dark Matter" and episode 9 is there, but it says it's $1.99. All the other episodes are marked "Download". So, for some reason, my season pass is not registering with episode 9. Anyone see this problem before?