Phillip,
The reason you can reach TCH and not some of the sites TCH hosts is because they have several data centers across the US. And apparently the route to the server TCH is on is not affected.
Do you have any files in the subdomain folder? If not that is why you are seeing a blank white screen. When you log into a subdomain you are put in that folder and cannot access anything above it.
If you want PM me your domian path and login/password and I will tell you what I see. Or you can open a help desk ticket and one of the techs will help.
Thomas,
It's the new X2 theme and your server does not have it yet. The X theme doesn't have the icons they are referring to here.
Oh and by the way, I don't care for the icons either. I prefer the list view.