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It looks to me like some ISPs have an updated DNS and some don't. I would probably recommend trying tomorrow if you don't want to deal with a hosts file.

I'm not sure why CR did a domain switch like this at the same time as the site change. Normally I do server switches like this:

1. Copy most of the content from old server to new server.
2. Repoint the domain.
3. Copy over the last of the data and stop updating anything on the old server.
4. Wait for propagation and then start working on the new server.

And THEN I would do an update. Switch content and servers/IPs at the same time doesn't seem like a terrific idea, but if they were switching server OS stuff, then I could see why they would do what they did.