WordPress MU

TROUBLESHOOTING
Is VHOST true or false? true
Is the path to your WordPress? MU install "/" or some directory? /
Anything in the error logs? No.
Did you receive any sort of error within your browser? No.
Does the information in wp_blogs, wp_users and wp_site match your blog, user and site? Yes.
Mention the version number, SVN check-in number or the date you downloaded the snapshot. 1.2.5 (freshly upgraded yesterday/10th Sept)
Plugins in place? Have you tried turning them off and seeing if that affects the issue? Yes, yes and no, it doesn't.
Server environment: Apache or IIS? What OS are you running? Apache/2.0.59 (Unix) DAV/2 PHP/4.4.4, custom Linux distro, info from uname -a is "Linux xorn 2.6.8-022stab078-up #1 Sun Sep 3 20:56:12 EDT 2006 i686 athlon-4 i386 GNU/Linux".
Any proxy or cache server in place? No. iptables packet filtering but that's irrelevant.
End user environment: Browser and version? (IE, Opera, Netscape, Safari?) OS? Security programs? Firefox 2.0.0.6 & IE 7 w/ XP Pro w/ Outpost Firewall & AVG Free (all correctly configured)

BACKGROUND
I have a setup where my WPMU site is running one blog on a subdomain of a custom domain. This is the only blog it's hosting.

Domain mapping thread has already been looked at and done. I've followed every step to the best of my ability.
Related forum post.

PROBLEM
In the Admin>>Blogs, WPMU doesn't seem to know that the blog exists - even though it works perfectly (we had to manually add it). Therefore the upgrade script doesn't upgrade that blog (because it doesn't see it, therefore this is only loosely related to upgrading) and I have no access to that blog via WPMU, except from its own wp-admin page.

Any suggestions on how I can add that blog into the blogs admin page? Is it possible?

I'd appreciate any help given.

Go to the domain that the sub is on, and you can manage it from there.

Well yes but I thought all blogs should show up in that page, no? Maybe not?

It's not that big of a deal, I guess. *shrug*

I think WPMU needs a little work then ;)

Uh, I would say you did something seriously wrong in the setup. MU does not work like that out of the box. When you say you added it manually, what did you do?

See the domain mapping thread above.
It ought to work like that out of the box :(

I'll consider this closed (non-critical) and move to my other problem, thanks for the help.