Due to a major hardware failure, the Calendar of Updates (CoU) was down for a bit. Sometimes when one thing happens, something else goes wrong as well. That is the case here. There was also a glitch with the recent backups so an older version of the database had to be restored.
Although there are some missing posts and tutorials, the important thing is that the site is back up and help and update are both available again at CoU. Welcome back, CoU!