Let's keep the wild speculation to a minimum.
The issue is being investigated. I believe that there may have been a class C IP address ban put in effect some time before the hosting upgrade, though I am a little hazy on the specifics.
Obviously the mods here are incompetent, so please delete my registration here. I won't be back.
Your prerogative, but try not to hold the moderators responsible for what is likely to be a server configuration setting.
Until we have gotten to the bottom of this issue and have some updates either way, I'm locking this thread.