About the Sunday night/Monday morning downtime. MetaChat was unavailable due to network maintenance from approx. 2:30 am GMT to 4:00 am GMT on Monday morning.
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Nothing bad happened. It was simply due to some planned network maintenance at our server host.
I did get some advance heads-up about this from them, but I just didn't get around to sharing it with the rest of you. Sorry about this; it's been a busy week. I pledge to do better at telling everyone about this sort of thing in the future!