I've been doing a lot of background work over the past few days to move all of the other forums onto new domain names (which is why I haven't been checking-in at CC). It started late last week so was perhaps related to the database work I was doing to find / replace previous URLs, and other bits and bobs.
In plainer English .... it was probably my fault.
Cheers,
Shaun
PS. Presumably it's back to normal now?