We've been running on dual servers for a while (save/load was still on the old server, everything else moved to the new server) but I'm doing the changeover tonight. I'm guessing if you're lucky you might get a few locked file/access errors briefly, or you might see some levels of yours disappear for a few minutes. Other weirdness may be abound. Not to worry though. All will be well.
As of 9:30PM PST the process has engaged and may take a few hours.
As of 11:30PM PST the process is almost done.
As of 11:52PM PST the transfer completed but the other requisite changes caused some "designID=0" save bugs;
I reverted to the original copy and am looking into it. Things should still be working fine; keep designing!
As of 12:04PM PST I've given up on what I can do, I've passed the details off to pacifist and I'm going to bed.
4:00PM PST starting up again, might see the occasional glitch.
6:00PM PST new server is throwing me wacky errors. Very plausible that it is all my fault. Even compiled a special version of the game just for testing but still no go. Will try again tomorrow.
7:00AM PST Still working