Yup, started on the 20th. I joined on the 18th and can vouch for the fact there were zero bugs before the maintenance. The staff said they moved some data, and some stuff got accidentally messed up.

They've also said that this weekend is an extended holiday in Japan, so it's likely this can only get fully looked at after Tuesday, when everyone is back in the office. They've been extremely receptive of the reports and communicative, great service for a free website.