It seems that the SQL server of one of my sites is down again. Error message was "SQL Error : 1030 Got error 28 from storage engine".
From what I could find in Google about it, it seems to be a lack of HD space in the SQL server. Advices I found? "Shut down the board and contact the host immediately". Blah.
Server name with problems: sizzle:katharyn. What's with these new names? It used to be just "sizzle", same to the other server, juno, that now is called "juno:kischa". Probably it messed up everything again.